feat(issues): Add hex parameterization experiment

[mrduncan]

Our existing hex parameterization supports hex values of any length however they must begin with either 0x or 0X. We frequently see hex values in messages which do not have this prefix (ex: trace ids or span ids).

This adds support for hex values which do not have the 0x prefix. To ensure it does not over-parameterize the following requirements:

• Must be exactly 4 or 8 bytes (8 or 16 characters)
• Must contain both a number and a letter
• Must use lowercase letters (anecdotally I've never seen examples where uppercase would be beneficial)

We're replacing the hex pattern in place in the experiment so that when this is rolled out it doesn't trigger a rehash.

The addition of EXPERIMENT_PARAMETERIZATION_REGEXES_MAP and other parameters will all be removed once the rollout of this is completed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #93970       +/-   ##
===========================================
+ Coverage   32.87%   83.22%   +50.35%     
===========================================
  Files        8839    10352     +1513     
  Lines      497640   598127   +100487     
  Branches    23233    23212       -21     
===========================================
+ Hits       163599   497791   +334192     
+ Misses     333573    98977   -234596     
- Partials      468     1359      +891     

[mrduncan]

We also can't use the built in lookahead attribute on ParameterizationRegex since we don't want it to match the existing pattern above on line 189.