adjust logging system (#51)

* remove ruff comment in log.py

* change log framework and fix llm_utils.py's logs

* Some thoughts for logging

* fix SingletonMeta's definition, maintain an instance dict for each class that inherits it

* adjust log codes directory, add some tag for factor implementation logging

* Update rdagent/core/conf.py

* fix factor task app & log

* fix log import

* Streamlet framework

* fix log tag to path logic

* Add todos

* Add example in docstring

* add log tag for llm_utils.py

* Capture lost content

---------

Co-authored-by: Young <afe.young@gmail.com>
Co-authored-by: you-n-g <you-n-g@users.noreply.github.com>

rdagent/components/coder/factor_coder/factor.py

@@ -16,7 +16,7 @@ from rdagent.core.exception import (
     RuntimeErrorException,
 )
 from rdagent.core.experiment import Experiment, FBImplementation, Task
-from rdagent.core.log import RDAgentLog
+from rdagent.log import rdagent_logger as logger
 from rdagent.oai.llm_utils import md5_hash
 
 
@@ -74,7 +74,7 @@ class FileBasedFactorImplementation(FBImplementation):
     ) -> None:
         super().__init__(*args, **kwargs)
         self.executed_factor_value_dataframe = executed_factor_value_dataframe
-        self.logger = RDAgentLog()
+        self.logger = logger
         self.raise_exception = raise_exception
 
     @staticmethod