[request] Export uast_utils marshal/unmarshal functions

[carlosms]

This is not a blocker, but it would be good to have at least unmarshalNodes exported so it can be used by gitbase-web.

[ajnavarro]

leave as it is right now. gitbase shouldn't be imported as a library.

The idea is in the future separate all the uast serialization logic to a separate library.

[mcarmonaa]

@ajnavarro should we close this then?

[ajnavarro]

We will add documentation explaining the output format of that Functions on documentation. Can you open an issue for this @mcarmonaa ? thanks.