Refactor CLI setup (#194)

* Initial cli split

* Fix version and entry points for CLI

* Remove redundant code from cli

* Fmt

* Major cleanup in cli package

* Imports

* Metavars and envvars

* Replace nargs=* options with comma-separated lists

* Comment on configs

.gitignore

@@ -26,7 +26,6 @@ share/python-wheels/
 .installed.cfg
 *.egg
 MANIFEST
-*/_version.py
 
 # PyInstaller
 #  Usually these files are written by a python script from a template

Makefile

@@ -1,5 +1,5 @@
 build: clean
-	python3 setup.py sdist bdist_wheel
+	python3 -m build
 .PHONY: build
 
 clean:
@@ -39,7 +39,7 @@ check-type:
 	mypy dbtmetabase
 .PHONY: check-type
 
-check: check-fmt check-lint-python check-type
+check: check-fmt check-imports check-lint-python check-type
 .PHONY: check
 
 test: