Add Metadata Upload Support to GCSHook Upload Method

[patricker]

Description

When uploading a file using the GCSHook Upload method, allow for optional metadata to be uploaded with the file. This metadata would then be visible on the blob properties in GCS.

Use case/motivation

Being able to associate metadata with a GCS blob is very useful for tracking information about the data stored in the GCS blob.

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[boring-cyborg]

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[potiuk]

Feel free to add it.