Feature Request: dolt bundle

Git has bundles which enable you to selectively export a part or all of your history to a single file, and work with that file as a remote except for pushing to it. It would be amazing to have a Dolt Bundle option to share data set histories through otherwise unsupported means.

As for how to implement the bundle format, I can think of several possible options:
1. basically package the .dolt directory structure
2. generate a sqlite-based file (and supporting any sqlite file as possible remote would be an incredible bonus possibility); it might be better though to think of a separate sqlite interop option?
3. replicate Git's bundle format but with dolt data mapped to it. This could create some rudimentary git/dolt interop
4. write a binary wire format to a file that is as efficient as possible for what we want to do with it