feat: print Dev Server URL on 'u' keypress to reduce terminal clutter

[HTGA75]

• This is a feature

For Bugs and Features; did you add new tests?

No new tests. This is a developer‑experience enhancement only.

Motivation / Use-Case

Sometimes the Dev Server URL scrolls out of view in busy terminals, making it hard to grab.
This change adds a new printUrlOnKeypress option (default false) that, when enabled, registers a keypress listener. Pressing u in the terminal will reprint the current Dev Server URL, reducing noisy automatic logs while still keeping the URL readily accessible.

Addresses discussion in #4907

Breaking Changes

None

Additional Info

• The option is gated behind:

  devServer: {
    printUrlOnKeypress: true
  }

[HTGA75]

👋 Hey @alexander-akait (or @webpack/collaborators), my branch is now up-to-date. Could someone please approve and run the CI workflows, and take a look at the changes? Thanks!

[codecov]

Codecov Report

Attention: Patch coverage is 15.38462% with 11 lines in your changes missing coverage. Please review.

Project coverage is 70.81%. Comparing base (af6bd68) to head (671a3dc).
Report is 132 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/Server.js	15.38%	8 Missing and 3 partials ⚠️

❗ There is a different number of reports uploaded between BASE (af6bd68) and HEAD (671a3dc). Click for more details.

HEAD has 35 uploads less than BASE

Flag	BASE (af6bd68)	HEAD (671a3dc)
	36	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5489       +/-   ##
===========================================
- Coverage   90.29%   70.81%   -19.49%     
===========================================
  Files          15        5       -10     
  Lines        1577     1422      -155     
  Branches      601      557       -44     
===========================================
- Hits         1424     1007      -417     
- Misses        140      356      +216     
- Partials       13       59       +46     

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