RFE: Allow matching a dolt branch name to a git source branch name

[grahamneville]

It would be useful to be able to change the branches of git sources whilst in a dolt branch.
For example:
A users might want to be able to add new devices and then bring in new configuration context data that might be in a git branch that hasn't yet been merged to master. Then be able to generate new configuration data for the new devices and perform testing before both merging the dolt branch and git branch for configuration context to main.

This would be really useful across all plugins that can use a git source.