Comet integration (#1939)

* Add first version of a Comet integration

* Remove debug prints

* Add test for Comet Configuration transformation to env variables

* Fix last lint warning

* Update Readme for Comet logging documentation

* Update Comet integration to be optional, update code and tests

* Add documentation for Comet configuration

* Add missing check

src/axolotl/cli/__init__.py

@@ -31,6 +31,7 @@ from axolotl.integrations.base import PluginManager
 from axolotl.logging_config import configure_logging
 from axolotl.train import TrainDatasetMeta
 from axolotl.utils.chat_templates import chat_templates
+from axolotl.utils.comet_ import setup_comet_env_vars
 from axolotl.utils.config import (
     normalize_cfg_datasets,
     normalize_config,
@@ -421,6 +422,8 @@ def load_cfg(config: Union[str, Path] = Path("examples/"), **kwargs):
 
     setup_mlflow_env_vars(cfg)
 
+    setup_comet_env_vars(cfg)
+
     return cfg