* add module-level docstrings
* update compiler docstrings
* update registry module docstrings
* add BaseComponent and children to public api, but discourage use
* update artifact docstrings and type annotations
* update dsl docstrings
* update client docstrings
* clean up kfp.__init__
* add dsl placeholder docstrings
* many more docstring updates
* document type aliases in dsl module
* add deprecated alias group
* add deprecated alias group tests
* implement deprecated alias group
* clean up other alias tests
* clean up docstring
* fix type annotations / mypy
* format with yapf
* add docstring parsing utils
* implement docstring parsing for help text
* implement smoke test of all cli commands
* clean up use of optional in docstring
* make command descriptions more consistent
* fix disable_type_check
* update release notes
* allow both singular and plural versions of nouns
* use command table for client creation
* cleanup
* simplify docker mock
* add docker to test requirements; clean up existing requirements
Connor McCarthy