Now can create annotations for symbollic alleles and masked alleles.

[jonn-smith]

• Updated data sources to include variant sites for symbolic alleles.
• Fixed tests to be correct for new logic.
• Now has tests for symbollic alternate alleles and masked alleles.

Fixes #5402

[codecov-io]

Codecov Report

Merging #5406 into master will increase coverage by 0.004%.
The diff coverage is 92.553%.

@@               Coverage Diff               @@
##              master     #5406       +/-   ##
===============================================
+ Coverage     87.027%   87.031%   +0.004%     
- Complexity     30440     30456       +16     
===============================================
  Files           1852      1853        +1     
  Lines         140936    140995       +59     
  Branches       15508     15518       +10     
===============================================
+ Hits          122653    122710       +57     
  Misses         12644     12644               
- Partials        5639      5641        +2

Impacted Files	Coverage Δ	Complexity Δ
...nder/tools/funcotator/FuncotatorUtilsUnitTest.java	92.577% <ø> (ø)	86 <0> (ø)	⬇️
...llbender/tools/funcotator/FuncotatorConstants.java	75% <100%> (+8.333%)	1 <1> (ø)	⬇️
...nder/tools/funcotator/FuncotatorTestConstants.java	97.826% <100%> (+0.099%)	1 <0> (ø)	⬇️
...ources/gencode/DataProviderForTroubleVariants.java	90.909% <90.909%> (ø)	1 <1> (?)
...dataSources/gencode/GencodeFuncotationFactory.java	87.304% <91.304%> (+0.472%)	207 <14> (+12)	⬆️
...ces/gencode/GencodeFuncotationFactoryUnitTest.java	91.815% <94.118%> (+0.193%)	63 <0> (+3)	⬆️
...oadinstitute/hellbender/utils/gcs/BucketUtils.java	81.098% <0%> (-0.61%)	42% <0%> (ø)

[LeeTL1220]

Minor stuff. Feel free to address and merge...