Composer: normalize the file, add script descriptions

[jrfnl]

Context

• Tidy up composer.json file and improve usability of scripts

Summary

This PR can be summarized in the following changelog entry:

• Tidy up composer.json file and improve usability of scripts

Relevant technical choices:

Composer: normalize the file

Well, mostly (scripts are not alphabetized, but still grouped by task).

Note: this is done as a one-time only action. The normalize script will not be run in CI to enforce normalization.

Style has been standardized to --indent-style=tab --indent-size=1.

Ref: https://github.com/ergebnis/composer-normalize

Composer: add script descriptions

These descriptions will be used when a list of the available scripts is requested on the command-line using the composer list or composer run -l commands.

These descriptions also help document the different scripts for the maintainers of the composer.json file.

Ref: https://getcomposer.org/doc/articles/scripts.md#custom-descriptions-

Test instructions

Test instructions for the acceptance test before the PR gets merged

This PR can be acceptance tested by following these steps:

• N/A

[coveralls]

Pull Request Test Coverage Report for Build 6431400124

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 48.608%

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Totals
Change from base Build 6431357349:	0.0%
Covered Lines:	1100
Relevant Lines:	2263

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💛 - Coveralls