* drop php 7.4 support
update composer.json minimums, and run rector over the code to update what it can. changed some static analysis
config to fix some rector-induced failures.
* adding union typehints
* reformat constructor property promotions
* updating/removing phpdoc
* suppress protobuf extension complaint
submitted a PR upstream to fix phan stubs
* don't validate packages against 7.4
* remove php8 polyfill
* fix readonly comments
* apply trailing commas to multiline fixer
upgrade php-cs-fixer, and apply a new rule for multiline comments
* remove unreachable default match arms for protobuf serializer
* adding more union types to vars
* use weakmap directly
* remove handling for not-supported WeakMap
* spacing
Brett McBride