This removes the deprecated parameters, attributes, and methods from

RepositoryInfo. These include name, supports_changesets,

supports_parent_diffs, and find_server_repository_info().
It also cleans up the module, switching to type annotations, moving

logging elsewhere, and adding a __repr__ to ease debugging.
Docstrings have been updated to use str instead of unicode, and

each attribute has been documented.
The constructor now requires keyword arguments. This is important as we

have code that subclasses this, and arguments are kind of a mess.

Currently, callers can continue to pass in positional arguments, but

that is deprecated and will result in a warning.
We have such callers in the codebase. Those will be updated separately.

Unit tests pass on Python 3.7-3.11.
Posted this change for review.