Convert custom snapshot system to jest snapshots

[cmdcolin]

I was unable to properly generate snapshots using CRAMJS_REWRITE_EXPECTED_DATA=true yarn test, running twice generated snapshot failures

As an alternative, there are built-in jest snapshots

This PR does no source code changes, just test changes, so should safely port over

The snapshots are fairly large, and the large dump.test.ts file is actually split into two files to avoid the github limit of 100mb. there is no concept of compressed jest snapshots, and it would limit snapshot effectiveness potentially to limit amount of data snapshotted, so this just stays the course

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aee975e) 89.91% compared to head (0b3e215) 90.14%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
+ Coverage   89.91%   90.14%   +0.22%     
==========================================
  Files          39       39              
  Lines        1983     1968      -15     
  Branches      395      388       -7     
==========================================
- Hits         1783     1774       -9     
+ Misses        199      193       -6     
  Partials        1        1              

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[cmdcolin]

note that the snapshots needed to get updated to support #132

[cmdcolin]

the diff is very large, but that is because the old snapshot system was already very large (1million+ line json files, mostly from a couple large pre-existing ce_large c.elegans cram files)

[cmdcolin]

if there are concerns let me know, but i think this should be ok to go :)