Meta: Add templates/checklists for new, Accepted/Rejected & Final PEPs

.github/PULL_REQUEST_TEMPLATE/accept-reject-pep.md

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+---
+name: Accept/Reject PEP
+about: Mark a draft Standards Track PEP as accepted or rejected
+title: "PEP NNN: Mark as Accepted"
+---
+
+# Accept/Reject PEP
+
+<!--
+You can help complete the following checklist yourself if you like
+by ticking any boxes you're sure about, like this: [x]
+
+If you're unsure about anything, just leave it blank and we'll take a look.
+-->
+
+* [ ] SC/PEP Delegate has formally accepted/rejected the PEP and posted to the ``Discussions-To`` thread
+* [ ] Pull request title in appropriate format (``PEP 123: Mark as Accepted``)
+* [ ] ``Status`` changed to ``Accepted``/``Rejected``
+* [ ] ``Resolution`` link points directly to SC/PEP Delegate official acceptance/rejected post
+* [ ] Acceptance/rejection notice added, if the SC/PEP delegate had major conditions or comments
+* [ ] ``Discussions-To``, ``Post-History`` and ``Python-Version`` up to date

.github/PULL_REQUEST_TEMPLATE/mark-pep-final.md

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+---
+name: Mark PEP Final
+about: Mark an Accepted Standards Track PEP as Final
+title: "PEP NNN: Mark Final"
+---
+
+# Mark PEP Final
+
+<!--
+You can help complete the following checklist yourself if you like
+by ticking any boxes you're sure about, like this: [x]
+If you're unsure about something, just leave it blank and we'll take a look.
+-->
+
+* [ ] Final implementation has been merged (including tests and docs)
+* [ ] PEP matches the final implementation
+* [ ] Any substantial changes since the accepted version approved by the SC/PEP delegate
+* [ ] Pull request title in appropriate format (``PEP 123: Mark Final``)
+* [ ] ``Status`` changed to ``Final`` (and ``Python-Version`` is correct)
+* [ ] Canonical docs/spec linked with a ``canonical-doc`` directive (or ``pypa-spec``, for packaging PEPs)

.github/PULL_REQUEST_TEMPLATE/modify-pep.md

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+---
+name: Update/modify PEP
+about: Add to or change an existing PEP
+title: "PEP NNN: Description of change"
+---
+
+<!--
+**Please** read our Contributing Guidelines (CONTRIBUTING.rst)
+to make sure this repo is the right place for your proposed change. Thanks!
+-->
+
+* Change is either:
+    * [ ] To a Draft PEP
+    * [ ] To an Accepted or Final PEP, with Steering Council approval
+    * [ ] To fix an editorial issue (markup, typo, link, header, etc)
+* [ ] PR title prefixed with PEP number (e.g. ``PEP 123: Summary of changes``)

.github/PULL_REQUEST_TEMPLATE/new-pep.md

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+---
+name: New PEP
+about: Submit a new draft PEP
+title: "PEP NNN: Title of PEP"
+labels: "new-pep"
+---
+
+# New PEP
+
+<!--
+You can use the following checklist when double-checking your PEP,
+and you can help complete some of it yourself if you like
+by ticking any boxes you're sure about, like this: [x]
+If you're unsure about anything, just leave it blank and we'll take a look.
+
+If your PEP is not Standards Track, remove the corresponding section.
+-->
+
+## Basic requirements (all PEP Types)
+
+* [ ] Read and followed [PEP 1](https://peps.python.org/1) & [PEP 12](https://peps.python.org/12)
+* [ ] File created from the [latest PEP template](https://github.com/python/peps/blob/main/pep-0012/pep-NNNN.rst?plain=1)
+* [ ] PEP has next available number, & set in filename (``pep-NNNN.rst``), PR title (``PEP 123: <Title of PEP>``) and ``PEP`` header
+* [ ] Title clearly, accurately and concisely describes the content in 79 characters or less
+* [ ] ``PEP``, ``Title``, ``Author``, ``Status`` (``Draft``), ``Type`` and ``Created`` headers filled out correctly
+* [ ] ``Sponsor``, ``PEP-Delegate``, ``Topic``, ``Requires`` and ``Replaces`` headers completed if appropriate
+* [ ] Required sections included
+    * [ ] Abstract (first section)
+    * [ ] Copyright (last section; exact wording from template required)
+* [ ] Code is well-formatted (PEP 7/PEP 8) and is in [code blocks, with the right lexer names](https://peps.python.org/pep-0012/#literal-blocks) if non-Python
+* [ ] PEP builds with no warnings, pre-commit checks pass and content displays as intended in the rendered HTML
+* [ ] Authors/sponsor added to ``.github/CODEOWNERS`` for the PEP
+
+
+## Standards Track requirements
+
+* [ ] PEP topic [discussed in a suitable venue](https://peps.python.org/pep-0001/#start-with-an-idea-for-python) with general agreement that a PEP is appropriate
+* [ ] [Suggested sections](https://peps.python.org/pep-0012/#suggested-sections) included (unless not applicable)
+    * [ ] Motivation
+    * [ ] Rationale
+    * [ ] Specification
+    * [ ] Backwards Compatibility
+    * [ ] Security Implications
+    * [ ] How to Teach This
+    * [ ] Reference Implementation
+    * [ ] Rejected Ideas
+    * [ ] Open Issues
+* [ ] ``Python-Version`` set to valid (pre-beta) future Python version
+* [ ] Any project stated in the PEP as supporting/endorsing/benefiting from it confirms such
+* [ ] Right before or after initial merging, [PEP discussion thread](https://peps.python.org/pep-0001/#discussing-a-pep) created and linked to in ``Discussions-To`` and ``Post-History``

.github/PULL_REQUEST_TEMPLATE/other.md

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+---
+name: Other
+about: Infra or meta change not falling in another category
+---
+
+<!--
+**Please** read our Contributing Guidelines (CONTRIBUTING.rst)
+to make sure this repo is the right place for your proposed change. Thanks!
+-->