GSPath md5 hash property could potentially be supported

[fafnirZ]

In the supported methods and properties table in the README, it shows that the md5 property is only supported for AzureBlobPath, but isnt supported for GSPath.

however there exists a property returned by bucket.get_blob: Blob.md5_hash
https://cloud.google.com/python/docs/reference/storage/latest/google.cloud.storage.blob.Blob#google_cloud_storage_blob_Blob_md5_hash

so if I understand correctly it should be as simple as updating a line in this dictionary to reflect that,

cloudpathlib/cloudpathlib/gs/gsclient.py

Line 119 in 7f1a5dc

return {

(and adding a property inside GSPath too)

Happy to submit a PR for it which addresses this and updates docs / tests if this functionality is wanted!!

[pjbull]

Great, we would accept a PR. You can find contribution guidelines here: https://cloudpathlib.drivendata.org/stable/contributing/