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/eventstore/handler/v2/statement.go

@@ -80,12 +80,10 @@ func (h *Handler) reduce(event eventstore.Event) (*Statement, error) {
 }
 
 type Statement struct {
-	AggregateType eventstore.AggregateType
-	AggregateID   string
-	Sequence      uint64
-	Position      float64
-	CreationDate  time.Time
-	InstanceID    string
+	Aggregate    *eventstore.Aggregate
+	Sequence     uint64
+	Position     float64
+	CreationDate time.Time
 
 	offset uint32
 
@@ -108,13 +106,11 @@ var (
 
 func NewStatement(event eventstore.Event, e Exec) *Statement {
 	return &Statement{
-		AggregateType: event.Aggregate().Type,
-		Sequence:      event.Sequence(),
-		Position:      event.Position(),
-		AggregateID:   event.Aggregate().ID,
-		CreationDate:  event.CreatedAt(),
-		InstanceID:    event.Aggregate().InstanceID,
-		Execute:       e,
+		Aggregate:    event.Aggregate(),
+		Sequence:     event.Sequence(),
+		Position:     event.Position(),
+		CreationDate: event.CreatedAt(),
+		Execute:      e,
 	}
 }