Feature/local caching

[justindujardin]

Add support for caching files locally from buckets.

Example

from gcspath import GCSPath, use_fs_cache
from pathlib import Path

use_fs_cache("/tmp/gcs_path_test/")
blob = GCSPath("/my-bucket/foo.txt")
blob.write_text("hello world!")

local_cache: Path = GCSPath.to_local(blob)
assert str(local_cache) == "/tmp/gcs_path_test/my-bucket/foo.txt"

Changes

• [x] Add use_fs_cache helper and tests
• [x] Add GCSPath.to_local for downloading and caching blobs (and tests)
• [x] Add from_bucket helper to make it easier to instantiate a GCSPath with just a bucket name

[justindujardin]

:tada: This PR is included in version 0.0.10 :tada:

The release is available on GitHub release

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