feat[venom]: parse hex literals in text format

[harkal]

What I did

Added hex parsing support to the venom text format parser

How I did it

How to verify it

Commit message

This commit adds hex parsing support to the venom text format parser

Description for the changelog

[charles-cooper]

looks good. i will add a test

[charles-cooper]

it's reasonable to reject odd-length hex literals, right?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.28%. Comparing base (11f0761) to head (ce17f6a).
Report is 90 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4532   +/-   ##
=======================================
  Coverage   92.28%   92.28%           
=======================================
  Files         123      123           
  Lines       17493    17495    +2     
  Branches     2952     2953    +1     
=======================================
+ Hits        16143    16145    +2     
  Misses        944      944           
  Partials      406      406           

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