Expose Storage pre-signed object delete url

[nolith]

This PR exposes pre-signed URLs for Google Cloud Storage

[icco]

Hi @nolith! Thanks for the PR. This actually looks like it might be better served by modifying https://github.com/fog/fog-google/blob/master/lib/fog/storage/google_json/requests/get_object_https_url.rb to have an optional argument of method that defaults to "GET", that way we don't need to create a new file for every single request type. What do you think?

[nolith]

Hi @icco thank you.

Looking at the code base I had the impression that each kind of request is supposed to be on a different class loaded with request.

This is exactly the same way get_object/get_object_url and put_object/put_object_url is implemented.

Adding an optional parameter to get_object_https_url it's a bit strange to me because I had the impression that get_ doesn't mean getter method but it's the name of the remote operation API, which is GetObject

[nolith]

The same PR has merged and released by fog-aws.

I would love to remove this monkey-patching from my production code.
Please @icco let me know what can I do to bring this forward. 🙏

Thanks

[icco]

Sorry, thought I had responded. Seems reasonable. In general we just like to remind people that the request level APIs are not stable, since this implies you won't be using this via a model api.

Thanks for your contribution!

[nolith]

No problem. Thank you