Make satis compatible with composer 2.3, 2.4 and add plugin mode

[ralflang]

• Fix compatibility issues with composer 2.3/2.4 in CLI mode
• Integrate ralflang/satis-plugin natively
• Change app kernel into a child of composer's app kernel and remove parts better inherited
• Satis as a root project will work as before, auto-installs a version of composer/composer for autoloading reasons
• Satis as a non-root project will give guidance that composer/composer is no longer automatically installed and what to do
• updated phpstan tool to not spam the CI log with php notices
• Updated unit tests to be phpstan l5 compliant after the composer/composer upgrade created breakage due to nested array type annotations

adresses #700, #694

[alcohol]

Ah, sorry, can you fix the conflicts first?

[private-packagist]

composer.lock

Package changes

Package	Operation	From	To	Changes
composer/class-map-generator	add	-	1.0.0	view code
seld/signal-handler	add	-	2.0.1	view code
composer/composer	upgrade	2.2.18	2.4.2	diff
composer/pcre	upgrade	1.0.1	3.0.0	diff
seld/phar-utils	upgrade	1.2.0	1.2.1	diff
symfony/console	upgrade	v5.4.12	v5.4.13	diff
symfony/filesystem	upgrade	v5.4.12	v5.4.13	diff
symfony/mime	upgrade	v5.4.12	v5.4.13	diff
symfony/string	upgrade	v5.4.12	v5.4.13	diff
twig/twig	upgrade	v3.4.2 ⚠️	v3.4.3 ✅	diff

Dev Package changes

Package	Operation	From	To	Changes
nikic/php-parser	upgrade	v4.14.0	v4.15.1	diff
phpunit/php-code-coverage	upgrade	9.2.16	9.2.17	diff
phpunit/phpunit	upgrade	9.5.23	9.5.25	diff
sebastian/comparator	upgrade	4.0.6	4.0.8	diff
sebastian/exporter	upgrade	4.0.4	4.0.5	diff
sebastian/type	upgrade	3.1.0	3.2.0	diff

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[ralflang]

Yes, I have merged the conflicts. Meanwhile PHPStan has some complaints and I think a re-test with different composer versions is due after work today. I will highlight you once I am done with that.

[alcohol]

PHPStan passing isn't really a requirement, more of a guide / nice-to-have. But I'm fine with waiting till after your test session(s) before merging this PR.

[ralflang]

@alcohol Test went through

In Standalone mode with "lowest" and "latest" dependencies allowed by constraints:

./bin/satis 
./bin/satis init
./bin/satis add  --type vcs --name "horde/text_diff" https://github.com/maintaina-com/text_diff
./bin/satis build satis.json /tmp/composer/

Lowest gives one deprecation warning in a dependency.

In plugin mode (only tested with latest dependencies)

composer satis:init
composer satis:add --type vcs --name "horde/text_diff" https://github.com/maintaina-com/text_diff
composer satis:build ./satis.json /tmp/composer/

I think we are good to go.

There are two places which smell like they might sense to be changed elsewhere.
For the sake of getting done I worked around them for now.

Composer/Application constructor does not accept optional name and version parameters.
This makes sense from Composer's POV as it thinks it is an app while satis CLI treats it as a library.
https://github.com/composer/satis/pull/701/files#diff-c3161949b1e6a9be81ac8e805ddd3d9f9a8da07e10e3932c297dfadf1ea47da7R37

If leaving out optional arguments to RootPackageLoader, it constructs its own version of VersionGuesser and in turn ProcessExecutor which it cannot really use.
https://github.com/composer/satis/pull/701/files#diff-1c8b1c04ba573f2bb91f1cfa0ce3bb2eca35a8004c5caa12abbf51d86496589dR203

Do you think it makes sense to open issues in the appropriate repos for further exploring these?