Add filters for ensuring deterministic snapshots

[FollowTheProcess]

Summary

This PR adds the concept of "filters" to snapshot.

A filter is a regex replacement that is applied to snapshots prior to serialisation, the goal of which is to replace non-deterministic (but known format) data
with deterministic placeholders.

Some motivating examples:

• Any valid UUID -> "[UUID]"
• A unix timestamp -> "[TIMESTAMP]"
• Temp folders on various platforms -> "[TEMP_FILE]"
• etc.

I wonder if we should provide a set of defaults? And possibly a way to opt out if not desired. Or just leave it completely up to the caller and provide no defaults, but document
some examples (like the above)

[codecov]

Codecov Report

Attention: Patch coverage is 95.16129% with 3 lines in your changes missing coverage. Please review.

Project coverage is 91.64%. Comparing base (bf8b2c4) to head (a7b74c7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
option.go	86.66%	2 Missing ⚠️
snapshot.go	97.87%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   89.25%   91.64%   +2.39%     
==========================================
  Files           3        3              
  Lines         307      323      +16     
==========================================
+ Hits          274      296      +22     
+ Misses         27       21       -6     
  Partials        6        6              

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