…nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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[Cache] Fix internal representation of non-static values

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

I'm working on a PR to allow exporting named closures, and the way we use closures in PhpArrayAdapter and PhpFilesAdapter gets into my way.

Instead of relying on `instanceof \Closure` checks, this PR adds an internal marker interface. This makes the logic specific to the component, enabling having closures as regular cached values.

The new logic is tested since adapters are.

Commits
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a5823af6053 [Cache] Fix internal representation of non-static values

* 6.4:
  [Cache] Fix internal representation of non-static values
  [Cache] Make `TagAwareAdapter` registrable as a service
  refactor: Unify & more humane translation message
  fix Resources translations validators.pt.xlf
  [Security] Pass attributes to nested `ChainUserProviders`
  [Validator] Update translation for the Video constraint
  [Messenger] Firebird Database - incompatibility with expected lowercase columns
  SQLSRV: Change column type from TEXT to STRING
  Fix exception catch when deleting temporary table in the sameDatabaseChecker
  [Serializer] Fix serializer crash due to asymmetric visibility on `protected(set)` properties

* 6.4:
  fix test setup
  [Validator] Review Turkish translations
  [Validator] Review Croatian translations
  [Validator] Review translations for Polish (pl)
  use the empty string instead of null as an array offset
  Review translations for Chinese (zh_TW)
  [Serializer] Adjust ObjectNormalizerTest for the accessor method changes from #61097

…al usages

* 6.4:
  Replace __sleep/wakeup() by __(un)serialize() for throwing and internal usages