factor out utils module

[martyall]

Factor out some utils to a separate module, came up in #2965 when trying to share some code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.84%. Comparing base (fe10025) to head (71fc4e8).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2965      +/-   ##
==========================================
- Coverage   76.85%   76.84%   -0.02%     
==========================================
  Files         258      259       +1     
  Lines       61202    61257      +55     
==========================================
+ Hits        47036    47071      +35     
- Misses      14166    14186      +20     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Fizzixnerd]

I wish decode_into wasn't required, but I guess rust move semantics aren't as advanced as I'd like!