cmd/geth: add db commands stats, compact, put, get, delete (#22014)

This PR introduces:

- db.put to put a value into the database
- db.get to read a value from the database
- db.delete to delete a value from the database
- db.stats to check compaction info from the database
- db.compact to trigger a db compaction

It also moves inspectdb to db.inspect.

cmd/geth/main.go

@@ -238,7 +238,6 @@ func init() {
 		removedbCommand,
 		dumpCommand,
 		dumpGenesisCommand,
-		inspectCommand,
 		// See accountcmd.go:
 		accountCommand,
 		walletCommand,
@@ -254,6 +253,8 @@ func init() {
 		licenseCommand,
 		// See config.go
 		dumpConfigCommand,
+		// see dbcmd.go
+		dbCommand,
 		// See cmd/utils/flags_legacy.go
 		utils.ShowDeprecated,
 		// See snapshot.go