Enhance VCF output

[apriha]

Several updates from Sano Genetics to enhance VCF output:

• Support VCF v4.3
• Ensure contig ID matches CHROM value
• Correctly populate null values for haploid chromosomes
• Handle reading and writing VCFs with imprecise indels
• Add several meta-information fields:
  • detectedCompany
  • detectedOriginalBuild
  • detectedSex
  • detectedChip

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 12 lines in your changes missing coverage. Please review.

Project coverage is 93.38%. Comparing base (28146f8) to head (eaf5824).
Report is 12 commits behind head on master.

Files	Patch %	Lines
src/snps/io/writer.py	78.18%	5 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   92.47%   93.38%   +0.91%     
==========================================
  Files           8        9       +1     
  Lines        1753     1815      +62     
  Branches      395      417      +22     
==========================================
+ Hits         1621     1695      +74     
+ Misses         84       66      -18     
- Partials       48       54       +6     

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