Feature/sniffle convert handling

[zhemingfan]

Addressing issues described in Issue 294

• Add support for uncertain types (e.g DEL/INS)
• Add error handling of cases where breakpoints breakpoint start > breakpoint end
• Add unit tests that includes aforementioned cases
• Add support for handling INVDUP from Sniffles input

[codecov[bot]]

Codecov Report

Merging #300 (2987227) into develop_v3 (841c364) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           develop_v3     #300      +/-   ##
==============================================
- Coverage       87.12%   87.10%   -0.02%     
==============================================
  Files              53       53              
  Lines            8831     8835       +4     
  Branches         2291     2293       +2     
==============================================
+ Hits             7694     7696       +2     
- Misses            691      692       +1     
- Partials          446      447       +1     

Flag	Coverage Δ
unittests	87.10% <100.00%> (-0.02%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/mavis/tools/constants.py	100.00% <ø> (ø)
src/mavis/tools/vcf.py	94.40% <100.00%> (+0.16%)	:arrow_up:
src/mavis/breakpoint.py	90.64% <0.00%> (-0.65%)	:arrow_down:

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