test: improve logger test and search functionality

- Improve the logger test to include more specific assertions.
- Add timestamp filtering to the logger search function.
- Fix a bug in the logger search function that prevented it from correctly handling continuation lines.
- Update redisclient tests to use the correct return type.

Co-authored-by: mahmmoud.hassanein <mahmmoud.hassanein@gmail.com>

lib/core/redisclient/redisclient_sadd_test.v

@@ -3,7 +3,7 @@ import freeflowuniverse.herolib.core.redisclient
 fn setup() !&redisclient.Redis {
 	mut redis := redisclient.core_get()!
 	redis.selectdb(10) or { panic(err) }
-	return &redis
+	return redis
 }
 
 fn cleanup(mut redis redisclient.Redis) ! {

lib/core/redisclient/redisclient_test.v

@@ -8,7 +8,7 @@ fn setup() !&redisclient.Redis {
 	mut redis := redisclient.core_get()!
 	// Select db 10 to be away from default one '0'
 	redis.selectdb(10) or { panic(err) }
-	return &redis
+	return redis
 }
 
 fn cleanup(mut redis redisclient.Redis) ! {