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This moves Python library code out of mojo/public/tools/bindings/pylib/
and into mojo/public/tools/mojom/.

Note that duplicate nested mojom/ directory name is intentional: the
repository will be named "mojom" and the top-level directory will
contain documentation and scripts, as well as other subdirectories. The
"mojom" subdirectory is then the home of the parser's Python modules.

This is all in preparation to mirror mojo/public/tools/mojom/ in a
read-only repository.

Bug: 1060467
Change-Id: I33c32f2c6b402b227408f8e5f1fc8c40be4dd3b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098849
Auto-Submit: Ken Rockot <rockot@google.com>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749373}