Fv3config

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- Add logging to write_run_directory command

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- Fix formatting of this changelog for PyPI

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Breaking changes:
~~~~~~~~~~~~~~~~~
- enable_restart function now requires an initial_conditions argument. It also sets
force_date_from_namelist to False.

Major changes:
~~~~~~~~~~~~~~

- a new public function `fv3config.get_bytes_asset_dict`
- a new command line interface `write_run_directory`
- removed integration tests for run_docker and run_native which actually executed the model
- all tests are now offline, using a mocked in-memory gcsfs to represent remote communication.
- add a Dockerfile to produce a lightweight image with fv3config installed

- Add new public functions `fv3config.get_nudging_assets` and `fv3config.update_config_for_nudging`.
- Add CLI entry points for enable_restart and update_config_for_nudging.

Minor changes:
~~~~~~~~~~~~~~
- updated create_rundir example to accept external arguments
- refactor get_current_date function to not require the path to the INPUT directory.

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Major changes:
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- the old "default" data options are removed
- orographic_forcing is now a required configuration key
- get_default_config() is removed, with a placeholder which says it was removed
- ensure_data_is_downloaded is removed, with a placeholder which says it was removed

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Major changes:
~~~~~~~~~~~~~~
- filesystem operations now manually backoff with a 1-minute max time on RuntimeError (which gcsfs often raises when it shouldn't) and gcsfs.utils.HttpError
- `put_directory` now makes use of a thread pool to copy items in parallel.

Minor changes:
~~~~~~~~~~~~~~
- `run_docker` now works when supplying an outdir on google cloud storage
- `put_directory` is now marked as package-private instead of module-private

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Major changes:
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- Add get_timestep and config_from_yaml functions

Minor changes:
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- Allow config_to_yaml to write to remote locations
- Control whether outputs are logged to console or not in `run_kubernetes`, `run_native`, and `run_docker`.

Breaking changes
~~~~~~~~~~~~~~~~
- Print stderr and stdout to the console by default when using fv3run. Use the
`--capture-output` command-line flag to enable the previous behavior.