Replace From bound with TryFrom

[michaelsproul]

Removing the From bound allows us to use MaybeQuoted with NonMaxEpoch (a wrapper around NonMaxU64).

[michaelsproul]

This is kinda WIP, until I finish the NonMaxEpoch migration in LH.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.60%. Comparing base (f2e2ea8) to head (bfbed33).

Files with missing lines	Patch %	Lines
src/quoted_int.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   83.19%   83.60%   +0.41%     
==========================================
  Files          14       14              
  Lines         238      244       +6     
==========================================
+ Hits          198      204       +6     
  Misses         40       40              

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