[script][click_helper] finalize the dump config functionality

bob/extension/config.py

bob/extension/data/test_dump_config.py

bob/extension/data/test_dump_config2.py

bob/extension/scripts/click_helper.py

bob/extension/scripts/config.py

bob/extension/test_click_helper.py

bob/extension/test_extensions.py

bob/extension/test_rc.py

bob/extension/utils.py

conda/meta.yaml

doc/annotate.py

doc/framework.rst

doc/py_api.rst