Bootstrapped databases with best practice role setup (#843)

* PreparedDatabases with default role setup

* merge changes from master

* include preparedDatabases spec check when syncing databases

* create a default preparedDB if not specified

* add more default privileges for schemas

* use empty brackets block for undefined objects

* cover more default privilege scenarios and always define admin role

* add DefaultUsers flag

* support extensions and defaultUsers for preparedDatabases

* remove exact version in deployment manifest

* enable CRD validation for new field

* update generated code

* reflect code review

* fix typo in SQL command

* add documentation for preparedDatabases feature + minor changes

* some datname should stay

* add unit tests

* reflect some feedback

* init users for preparedDatabases also on update

* only change DB default privileges on creation

* add one more section in user docs

* one more sentence

pkg/util/constants/roles.go

@@ -14,4 +14,8 @@ const (
 	RoleFlagCreateDB          = "CREATEDB"
 	RoleFlagReplication       = "REPLICATION"
 	RoleFlagByPassRLS         = "BYPASSRLS"
+	OwnerRoleNameSuffix       = "_owner"
+	ReaderRoleNameSuffix      = "_reader"
+	WriterRoleNameSuffix      = "_writer"
+	UserRoleNameSuffix        = "_user"
 )