Add benchmark tests and optimize database performance

- Introduced benchmark tests for various database operations, including event saving, querying, and fetching by serials, to assess performance.
- Implemented optimizations to reduce memory allocations and improve efficiency by pre-allocating slices and maps in critical functions.
- Enhanced the `FetchEventsBySerials`, `GetFullIdPubkeyBySerials`, and `QueryForIds` methods with pre-allocation strategies to minimize reallocations.
- Documented performance improvements in the new PERFORMANCE_REPORT.md file, highlighting significant reductions in execution time and memory usage.
- Bumped version to v0.23.1 to reflect these changes.

pkg/database/get-fullidpubkey-by-serials.go

@@ -17,6 +17,8 @@ import (
 func (d *D) GetFullIdPubkeyBySerials(sers []*types.Uint40) (
 	fidpks []*store.IdPkTs, err error,
 ) {
+	// Pre-allocate slice with exact capacity to reduce reallocations
+	fidpks = make([]*store.IdPkTs, 0, len(sers))
 	if len(sers) == 0 {
 		return
 	}