Update support for custom granularity in other types

[WilliamDee]

Description

Support custom grain by switching the typing to be not on TimeGranularity

• Metric.time_granularity - TimeGranularity -> str
• Metric.type_params.cumulative_type_params.grain_to_date - TimeGranularity -> str
• MetricInput.offset_to_grain - TimeGranularity -> str
• MetricTimeWindow.granularity - TimeGranularity -> str affects the following
  • Metric.type_params.conversion_type_params.window
  • Metric.type_params.cumulative_type_params.window
  • MetricInput.offset_window

Changes to MetricTimeWindow

Because MetricTimeWindow.granularity is now a string, we allow it to be not as strict when ensuring it's a valid granularity during initial yaml parsing (since we don't have access to the custom granularities). Then during validations, we will properly validate that it's a valid grain, and during the transformation step we will remove trailing 's'.

Checklist

• [x] I have read the contributing guide and understand what's expected of me
• [x] I have signed the CLA
• [x] This PR includes tests, or tests are not required/relevant for this PR
• [x] I have run changie new to create a changelog entry

Resolves SL-2826

[linear[bot]]

SL-2826 Enable custom granularities for DSI YAML objects

[github-actions[bot]]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[github-actions[bot]]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.