auto-versioning and adding axolotl.__version__ (#2127)

* auto-versioning and adding axolotl.__version__

* removing file meant for codecov PR

* adding dynamic dependencies, project metadata

* extras/optional-dependencies are dynamic too

---------

Co-authored-by: Dan Saunders <dan@axolotl.ai>
Co-authored-by: Wing Lian <wing@axolotl.ai>

src/axolotl/__init__.py

@@ -0,0 +1,8 @@
+"""Axolotl - Train and fine-tune large language models"""
+
+try:
+    from importlib.metadata import version
+
+    __version__ = version("axolotl")
+except ImportError:
+    __version__ = "unknown"