feat: modernize, add strong types, add phpstan, add php-cs-fixer, get…

[Chris53897]

… phpunit running convert phpunit config-files to v. 9.5 add github actions use promoted property constructors remove useless comments and annotations add phpstan-annotation add TODO Entries for ideas to improve further move config-files to the default location fix namespaces in tests improve tests adjust readme

Hi. I know it is a big PR. Sorry for that. This PR targets a new major version as there are BC brakes with the Strong types.

TODOs

• Test in real life application
• remove Temp added getters (private attributes testing is not available anymore in phpunit 9). Needs to be refactored to check with reflections.
• Check if IDs int vs string (Existing Unittests say it is all int)
• Fix broken Tests: 3 Tests are failing. This is for changes with the new parameter for brigthness. I have no knowledge about that feature. Please fix that by yourself (as you introduced this parameter). https://github.com/Chris53897/Phue/runs/7825345192?check_suite_focus=true

Please let me know what you think. Greetz