Fix parsing header lines where values are containing square bracket lists

[cmdcolin]

Two examples from the VCF 4.5 spec that demonstrate complex to 'parse' examples include

##META=<ID=Assay,Type=String,Number=.,Values=[WholeGenome, Exome]>


##INFO=<ID=DB,Number=0,Type=Flag,Description="dbSNP membership, build 129">

both of these show that it is a little tricky to parse correctly, as you cannot just split the text within the <...> by comma, and then split by =...

To fix this, I used claude AI to help create the parseMetaString function. I first prompted the claude AI with a regex from here https://stackoverflow.com/a/18893443/2129219 which is quite complex already and told it to add support for the square brakets. It generated a non-working regex in the next step, but then i told it it didn't work and went into an infinite loop and it said, you're right, here is an alternative approach which is just a simple function that parses it out more precisely than the regex.

pretty smart. I credited the claude AI in the function

[codecov]

Codecov Report

Attention: Patch coverage is 98.46154% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.72%. Comparing base (8d5c951) to head (dc4e328).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
src/parse.ts	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
- Coverage   96.33%   94.72%   -1.61%     
==========================================
  Files           3        4       +1     
  Lines         218      683     +465     
  Branches       87      102      +15     
==========================================
+ Hits          210      647     +437     
- Misses          8       36      +28     

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