* fixing psalm complaints
use rector (and psalm) to add Override attributes, and add symfony polyfill to
provide Override in earlier php versions

* fixing more psalm complaints

* more fixes

* adding stubs for deptrac
there are some things in our code that deptrac doesn't understand or are missing
for some php versions. stub them to quieten all those violation warnings

* why not cache invalid :(

* display tools versions

* fix tools cache key

* changing cache key

* dont complain about unused psalm suppressions

* suppress invalid attribute

* quieten phpstan php8.5 complaints

* revert previous commit...now other php versions complain about an unused ignore :(

* revert typecasting in metrics aggregators

* Update src/Contrib/Otlp/ProtobufSerializer.php

Co-authored-by: Chris Lightfoot-Wild <[email protected]>

* remove override stub and use the polyfill from deptrac

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Co-authored-by: Chris Lightfoot-Wild <[email protected]>

* Configuration\CompositeResolver can discover additional configuration resolvers via SPI.

* Apply suggestions from code review

Co-authored-by: Tobias Bachert <[email protected]>

* Fix imports.

* Porting EnvSourceProvider changes from Nevay.

* Moved VlucasPhpdotenvProvider to sdk-configuration.

* Added SdkConfigurationResolver.

* Added SymfonyDotenvProvider.

* Removed vlucas/phpdotenv dev package.

* make style 😎

* Update deptrac for dotenv providers.

* Suppress Psalm errors for optional packages.

* Added phpstan ignoreErrors rules for optional dependency behavior.

* Added test for SPI-backed configuration loading via EnvSourceProvider

* Restructure SPI based test for EnvSourceProvider.

* Bumped SPI dependency.

* Added implied mixed return type to ResolverInterface::retrieveValue

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Co-authored-by: Tobias Bachert <[email protected]>