Feature/3391 support gcs artifacts

[Pleezon]

This PR implements Google Cloud Storage support as described in this issue: #3391.
I've added 'google-cloud-storage' as an extra, installable via aim[gcs]. In the future, boto3 should probably also be handled like this.

How to test these changes locally

Optionally, host a local gcs emulator:

docker run -d --name fake-gcs-server -p 4443:4443 fsouza/fake-gcs-server

Then, create a new project, add path/to/aim[gcs] as a dependency, and test:

import os
import tempfile
import time

import aim

os.environ["GOOGLE_CLOUD_PROJECT"] = "test"
os.environ["STORAGE_EMULATOR_HOST"] = "http://localhost:4443"

aim_run = aim.Run()
aim_run.set_artifacts_uri("gs://test")

with tempfile.TemporaryDirectory() as temp_dir:
    file_path = os.path.join(temp_dir, "test.yaml")
    with open(file_path, "w") as temp_file:
        temp_file.write("test")

    aim_run.log_artifact(file_path, name="test.yaml")

Note: As of right now, there are no tests implemented for (any) artifact storage. These could either be added to this PR or (because adding them would imply testing things unrelated to this pr) be implemented in another PR.