perf(cache): pgx pool connector (#8703)

# Which Problems Are Solved

Cache implementation using a PGX connection pool.

# How the Problems Are Solved

Defines a new schema `cache` in the zitadel database.
A table for string keys and a table for objects is defined.
For postgreSQL, tables are unlogged and partitioned by cache name for
performance.

Cockroach does not have unlogged tables and partitioning is an
enterprise feature that uses alternative syntax combined with sharding.
Regular tables are used here.

# Additional Changes

- `postgres.Config` can return a pxg pool. See following discussion

# Additional Context

- Part of https://github.com/zitadel/zitadel/issues/8648
- Closes https://github.com/zitadel/zitadel/issues/8647

---------

Co-authored-by: Silvan <silvan.reusser@gmail.com>

go.mod

@@ -38,7 +38,7 @@ require (
 	github.com/h2non/gock v1.2.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/improbable-eng/grpc-web v0.15.0
-	github.com/jackc/pgx/v5 v5.6.0
+	github.com/jackc/pgx/v5 v5.7.0
 	github.com/jarcoal/jpath v0.0.0-20140328210829-f76b8b2dbf52
 	github.com/jinzhu/gorm v1.9.16
 	github.com/k3a/html2text v1.2.1
@@ -49,6 +49,7 @@ require (
 	github.com/muhlemmer/gu v0.3.1
 	github.com/muhlemmer/httpforwarded v0.1.0
 	github.com/nicksnyder/go-i18n/v2 v2.4.0
+	github.com/pashagolub/pgxmock/v4 v4.3.0
 	github.com/pquerna/otp v1.4.0
 	github.com/rakyll/statik v0.1.7
 	github.com/rs/cors v1.11.0
@@ -76,12 +77,12 @@ require (
 	go.opentelemetry.io/otel/sdk/metric v1.28.0
 	go.opentelemetry.io/otel/trace v1.28.0
 	go.uber.org/mock v0.4.0
-	golang.org/x/crypto v0.25.0
+	golang.org/x/crypto v0.27.0
 	golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8
 	golang.org/x/net v0.26.0
 	golang.org/x/oauth2 v0.22.0
 	golang.org/x/sync v0.8.0
-	golang.org/x/text v0.17.0
+	golang.org/x/text v0.18.0
 	google.golang.org/api v0.187.0
 	google.golang.org/genproto/googleapis/api v0.0.0-20240701130421-f6361c86f094
 	google.golang.org/grpc v1.65.0
@@ -169,7 +170,7 @@ require (
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
-	github.com/jackc/pgservicefile v0.0.0-20231201235250-de7065d80cb9 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jonboulle/clockwork v0.4.0
 	github.com/klauspost/compress v1.17.9 // indirect