chore: oauth2 scopes middleware

composer.json

composer.lock

docs/pages/index.md

src/Attribute/HasOAuth2Scope.php

src/Attribute/OAuth2Authenticated.php

src/Attribute/ProvidesOAuth2Scope.php

src/AuthenticatedUser.php

src/AuthenticatedUserProvider.php

src/AuthenticatedUserSource.php

src/CrudActionGateInterface.php

src/CurrentUserProvider.php

src/Gatekeeper.php

src/GatekeeperRequestContext.php

src/GatekeeperUserContext.php

src/HttpMiddleware/HasOAuth2ScopeMiddleware.php

src/OAuth2Claim.php

src/OAuth2ClaimReader.php

src/OAuth2ScopePattern.php

src/OAuth2ScopePatternChunk.php

src/OAuth2ScopePatternChunkTest.php