query saffron

[martyall]

This work completes the query feature and includes PRs #2972 and #2975

The goal is to be able to query data which is stored in encoded form (as field elements), using the binary indices of the original data

NOTE: The first commit diff is large, the rest are aiming to refactor that commit so should be more manageable

• Add a query interface to query field encoded data
• Add tests, including edge cases
• Move UserData arbitrary instance to utils

[codecov]

Codecov Report

Attention: Patch coverage is 95.16908% with 10 lines in your changes missing coverage. Please review.

Project coverage is 76.93%. Comparing base (97ee9f7) to head (bd4a885).
Report is 52 commits behind head on master.

Files with missing lines	Patch %	Lines
saffron/src/utils.rs	95.09%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2974      +/-   ##
==========================================
+ Coverage   76.87%   76.93%   +0.06%     
==========================================
  Files         262      262              
  Lines       61445    61614     +169     
==========================================
+ Hits        47234    47401     +167     
- Misses      14211    14213       +2     

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