allow different format options for dolt branch with track flag

[jennifersp]

Git allows:
git branch feature --track origin/feature
git branch --track request origin/feature
git branch feature --track=direct origin/feature
git branch --track=direct feature origin/feature
for creating new branch that tracks given remote tracking branch

does not allow:
git branch feature --track direct origin/feature, but Dolt allows it as --track direct and --track=direct are considered the same

[fulghum]

Code change looks fine, just a couple of notes to make sure we have enough test coverage.

Could you also take a look at the SQL path for dolt_branch and see if we need to update anything there to have the same functionality and test coverage?

[fulghum]

Nice! Assuming all those CI tests pass, this looks good to go! 🙌