build: add cspell ESLint plugin for spellchecking

[Planeshifter]

Description

What is the purpose of this pull request?

This pull request:

• adds the @cspell/eslint-plugin for spellchecking support via ESLint.

The spellchecking is configured to only run on comments and strings as CSpell generates way too many false positives for variable identifiers; the plugin is configured further via a bunch of regular expressions that additionally limit what is scanned to e.g. ignore LaTeX equations, links or parts of example code.

Related Issues

Does this pull request have any related issues?

No.

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• [x] Read, understood, and followed the contributing guidelines.

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