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/instance_by_id.sql

@@ -7,6 +7,16 @@ with features as (
 	cross join projections.system_features s
 	full outer join projections.instance_features2 i using (key, instance_id)
 	group by instance_id
+), external_domains as (
+	select instance_id, array_agg(domain) as domains
+	from projections.instance_domains
+    where instance_id = $1
+	group by instance_id
+), trusted_domains as (
+	select instance_id, array_agg(domain) as domains
+	from projections.instance_trusted_domains
+    where instance_id = $1
+	group by instance_id
 )
 select
     i.id,
@@ -20,9 +30,13 @@ select
 	s.enable_impersonation,
     l.audit_log_retention,
     l.block,
-	f.features
+	f.features,
+    ed.domains as external_domains,
+	td.domains as trusted_domains
 from projections.instances i
 left join projections.security_policies2 s on i.id = s.instance_id
 left join projections.limits l on i.id = l.instance_id
 left join features f on i.id = f.instance_id
+left join external_domains ed on i.id = ed.instance_id
+left join trusted_domains td on i.id = td.instance_id
 where i.id = $1;