feat: add support for accessor arrays and refactor stats/base/nanmaxabs

[gururaj1512]

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Resolves #None.

Description

What is the purpose of this pull request?

This pull request:

• update stats/base/nanmaxabs to follow latest project conventions
• add support for accessor arrays

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This pull request:

• No

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• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
stats/base/nanmaxabs	$\color{green}297/297$ $\color{green}+100.00\%$	$\color{green}38/38$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}297/297$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

LGTM.

@gururaj1512 The fixes that I made wrt returning the absolute value will also need to be applied to nanminabs which has the same bugs.