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tools/traffic_annotation/auditor/ is currently written in C++ which
poses some problems in the way of convenience. Rewriting it in
Python overcomes some of these issues.

Missing:
 - Exporter to annotations.xml.
 - Exporter to tsv.
 - Writing to a summary file.
 - Matching/completing partial annotations.
 - Handling exceptions list.
 - Performing all other remaining checks on annotations.
 - Raise an error on mutable tags.
 - Safelist filtering of extracted annotations.
 - Enforcing consistency between summary/grouping.xml and
   new annotations.
 - Checking for reserved ids and deprecated hash codes.
 - ID checking on annotations.
 - Handling removed annotations and deprecated annotations.
 - The remaining TODOs found in this CL.

Parity:
 - Extracting annotations according to the compiled proto.
 - Checking annotations' completeness.
 - Catching fatal/syntax errors.
 - "deserialization" of extracted annotations.

Bug: 1119417
Change-Id: Idd09b89577342e59011441b30a54437234ddb1bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364935
Commit-Queue: Mohamadou Bella Bah <bellabah@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802831}