feat(eventstore): add search table (#8191)

# Which Problems Are Solved

To improve performance a new table and method is implemented on
eventstore. The goal of this table is to index searchable fields on
command side to use it on command and query side.

The table allows to store one primitive value (numeric, text) per row.

The eventstore framework is extended by the `Search`-method which allows
to search for objects.
The `Command`-interface is extended by the `SearchOperations()`-method
which does manipulate the the `search`-table.

# How the Problems Are Solved

This PR adds the capability of improving performance for command and
query side by using the `Search`-method of the eventstore instead of
using one of the `Filter`-methods.

# Open Tasks

- [x] Add feature flag
- [x] Unit tests
- [ ] ~~Benchmarks if needed~~
- [x] Ensure no behavior change
- [x] Add setup step to fill table with current data
- [x] Add projection which ensures data added between setup and start of
the new version are also added to the table

# Additional Changes

The `Search`-method is currently used by `ProjectGrant`-command side.

# Additional Context

- Closes https://github.com/zitadel/zitadel/issues/8094

internal/api/grpc/feature/v2/converter.go

@@ -109,6 +109,10 @@ func improvedPerformanceTypeToPb(typ feature.ImprovedPerformanceType) feature_pb
 		return feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_UNSPECIFIED
 	case feature.ImprovedPerformanceTypeOrgByID:
 		return feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_ORG_BY_ID
+	case feature.ImprovedPerformanceTypeProjectGrant:
+		return feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_PROJECT_GRANT
+	case feature.ImprovedPerformanceTypeProject:
+		return feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_PROJECT
 	default:
 		return feature_pb.ImprovedPerformance(typ)
 	}
@@ -133,6 +137,10 @@ func improvedPerformanceToDomain(typ feature_pb.ImprovedPerformance) feature.Imp
 		return feature.ImprovedPerformanceTypeUnknown
 	case feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_ORG_BY_ID:
 		return feature.ImprovedPerformanceTypeOrgByID
+	case feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_PROJECT_GRANT:
+		return feature.ImprovedPerformanceTypeProjectGrant
+	case feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_PROJECT:
+		return feature.ImprovedPerformanceTypeProject
 	default:
 		return feature.ImprovedPerformanceTypeUnknown
 	}