[Py SDK] Expand Plugin to support transform

[jcrichlake]

Summary

The Existing python plugin needs to be updated to support toCommonGrants and fromCommonGrants transformations.

Acceptance criteria

• The existingcommon-grants Python plugin is expanded to have mappings for both toCommonGrants and fromCommonGrants plugins. At least 90 percent of mapped fields are preserved.
• The updated plugin is published to PyPi