feat(storage): generic cache interface (#8628)

# Which Problems Are Solved

We identified the need of caching.
Currently we have a number of places where we use different ways of
caching, like go maps or LRU.
We might also want shared chaches in the future, like Redis-based or in
special SQL tables.

# How the Problems Are Solved

Define a generic Cache interface which allows different implementations.

- A noop implementation is provided and enabled as.
- An implementation using go maps is provided
  - disabled in defaults.yaml
  - enabled in integration tests
- Authz middleware instance objects are cached using the interface.

# Additional Changes

- Enabled integration test command raceflag
- Fix a race condition in the limits integration test client
- Fix a number of flaky integration tests. (Because zitadel is super
fast now!) 🎸 🚀

# Additional Context

Related to https://github.com/zitadel/zitadel/issues/8648

internal/query/projection/event_test.go

@@ -74,8 +74,8 @@ func assertReduce(t *testing.T, stmt *handler.Statement, err error, projection s
 	if want.err != nil && want.err(err) {
 		return
 	}
-	if stmt.AggregateType != want.aggregateType {
-		t.Errorf("wrong aggregate type: want: %q got: %q", want.aggregateType, stmt.AggregateType)
+	if stmt.Aggregate.Type != want.aggregateType {
+		t.Errorf("wrong aggregate type: want: %q got: %q", want.aggregateType, stmt.Aggregate.Type)
 	}
 
 	if stmt.Sequence != want.sequence {