BA: Handle multiple file versions + introduce gzip size

[JerrySentry]

Create a mechanism to handle parsing of different stats file versions, depending on the version value in the JSON file it will choose the appropriate parser logic. The difference between V1 and V2 is that V2 introduces gzip sizes for assets in the JSON file. In V2 parser it will read and store that value, whereas in V1 parser it will just use the old not-smart logic by assuming the gzip size is 1/1000th of the uncompressed size; beyond that V1 and V2 is identical in logic. The gzip size is then stored into the bundle report (ie SQLite DB).

I duplicated the code instead of modularizing it because having a bunch of version specific logic littered within one parser seems more unwieldy over time when there is many versions. Also with the proposed setup it helps with deprecating old ones where we can simply just delete old parsers and older versions' parsers shouldn't be touched most of the time.

closes codecov/engineering-team#1926
closes codecov/engineering-team#1927

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.24%. Comparing base (093f199) to head (40074e6).

❗ Current head 40074e6 differs from pull request most recent head 9041846

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #266      +/-   ##
==========================================
- Coverage   90.27%   89.24%   -1.04%     
==========================================
  Files         353      324      -29     
  Lines       11149     9993    -1156     
  Branches     1982     1782     -200     
==========================================
- Hits        10065     8918    -1147     
+ Misses       1014     1005       -9     
  Partials       70       70              

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