Add a default retry parameter to all public methods

[krisowski]

All public storage method should have a default retry parametr defined so that clients don't have to explicitly use the @retry.Retry decorator to handle transient issues, like 503 error code.

The solution could look similar to the implementation in the google-cloud-bigquery where retry is implemented in every public method and it is set to DEFAULT_RETRY by default.

[HemangChothani]

Almost all the public methods has retry parameter with default value, adding in the remaining methods and will expose the parameter for users.

python-storage/google/cloud/storage/client.py

Lines 528 to 535 in 6a0b8a7

	api_response = self._connection.api_request(
	method="POST",
	path="/b",
	query_params=query_params,
	data=properties,
	_target_object=bucket,
	timeout=timeout,
	retry=DEFAULT_RETRY,