feat: encryption keys in database (#3265)

* enable overwrite of adminUser fields in defaults.yaml

* create schema and table

* cli: create keys

* cli: create keys

* read encryptionkey from db

* merge v2

* file names

* cleanup defaults.yaml

* remove custom errors

* load encryptionKeys on start

* cleanup

* fix merge

* update system defaults

* fix error message

cmd/admin/initialise/sql/06_system.sql

@@ -0,0 +1 @@
+CREATE SCHEMA system;

cmd/admin/initialise/sql/07_encryption_keys_table.sql

@@ -0,0 +1,6 @@
+CREATE TABLE system.encryption_keys (
+	id TEXT NOT NULL
+	, key TEXT NOT NULL
+
+	, PRIMARY KEY (id)
+);

cmd/admin/initialise/sql/README.md

@@ -9,6 +9,8 @@ The sql-files in this folder initialize the ZITADEL database and user. These obj
 - 03_grant_user.sql: grants the user created before to have full access to its database. The user needs full access to the database because zitadel makes ddl/dml on runtime
 - 04_eventstore.sql: creates the schema needed for eventsourcing
 - 05_projections.sql: creates the schema needed to read the data
-- files 06_enable_hash_sharded_indexes.sql and 07_events_table.sql must run in the same session
-  - 06_enable_hash_sharded_indexes.sql enables the [hash sharded index](https://www.cockroachlabs.com/docs/stable/hash-sharded-indexes.html) feature for this session
-  - 07_events_table.sql creates the table for eventsourcing
+- 06_system.sql: creates the schema needed for ZITADEL itself
+- 07_encryption_keys_table.sql: creates the table for encryption keys (for event data)
+- files 08_enable_hash_sharded_indexes.sql and 09_events_table.sql must run in the same session
+  - 08_enable_hash_sharded_indexes.sql enables the [hash sharded index](https://www.cockroachlabs.com/docs/stable/hash-sharded-indexes.html) feature for this session
+  - 09_events_table.sql creates the table for eventsourcing