Add get_rule_group method

[beeradb]

Description

This PR adds a get_rule_group method to the AlertProvisioning API, which uses the /v1/provisioning/folder/%s/rule-groups/%s endpoint.

It also renames update_rule_group_interval to update_rule_group for consistency while maintaining the previous method for backward compatibility. I'm happy to revert this change if you'd rather avoid it.

I also attempted to add tests to this. However, I'm unfamiliar with your mocking library and am unsure where to register the API path, and thus got a requests_mock.exceptions.NoMockAddress exception. If this change requires test coverage, I'd be happy to try and add it, but I'd need to be pointed in the right direction.

[codecov]

Codecov Report

Merging #108 (a8630e6) into main (ddb51f1) will decrease coverage by 0.27%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
- Coverage   97.61%   97.34%   -0.27%     
==========================================
  Files          24       24              
  Lines        1465     1471       +6     
==========================================
+ Hits         1430     1432       +2     
- Misses         35       39       +4     

Files Changed	Coverage Δ
grafana_client/elements/alertingprovisioning.py	56.97% <42.85%> (-1.78%)	⬇️

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[amotl]

Thank you very much.