Create pylint and yapf style files.

The only diff from Google's pylintrc [0] is disabling `no-name-in-module` (it
doesn't like our `del _src` trick).

To run pylint:

    $ pylint haiku
    ------------------------------------
    Your code has been rated at 10.00/10

To reformat a file with yapf (first looks at the diff, second reformats
in-place):

    $ yapf --diff haiku/_src/base.py
    $ yapf --in-place haiku/_src/base.py

I will add a GitHub action that enforces pylint is clean in a follow up change.

[0] https://google.github.io/styleguide/pylintrc

PiperOrigin-RevId: 302323789
Change-Id: Id13746a4c8d7cc3368a2186ab340ae5bd678fb95

Author: tomhennigan