Make Validation error emit the validation type that was violated

[yfarjoun]

Validation errors are not helpful for figuring out how to ignore or fix the problem.

By emitting the Type of the validation error, this PR helps the user know which validation error needs to be ignored, or search the code to understand the problem.

[codecov-io]

Codecov Report

Merging #1395 into master will increase coverage by 1.583%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##             master     #1395       +/-   ##
==============================================
+ Coverage     68.03%   69.613%   +1.583%     
- Complexity     8368      9686     +1318     
==============================================
  Files           573       573               
  Lines         33885     38135     +4250     
  Branches       5662      6935     +1273     
==============================================
+ Hits          23052     26547     +3495     
- Misses         8643      9206      +563     
- Partials       2190      2382      +192

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/htsjdk/samtools/SAMValidationError.java	96.154% <100%> (+0.037%)	9 <0> (ø)	⬇️
src/main/java/htsjdk/variant/vcf/VCFConstants.java	70% <0%> (-17.5%)	1% <0%> (ø)
...main/java/htsjdk/variant/vcf/VCFHeaderVersion.java	68% <0%> (-3.875%)	21% <0%> (+8%)
src/main/java/htsjdk/samtools/BAMSBIIndexer.java	73.333% <0%> (-1.667%)	1% <0%> (ø)
src/main/java/htsjdk/variant/vcf/VCFHeader.java	89.362% <0%> (-0.697%)	124% <0%> (+48%)
src/main/java/htsjdk/samtools/util/Interval.java	68.293% <0%> (-0.041%)	41% <0%> (+12%)
src/main/java/htsjdk/tribble/Tribble.java	100% <0%> (ø)	16% <0%> (+8%)	⬆️
...s/cram/encoding/external/ExternalByteEncoding.java	100% <0%> (ø)	10% <0%> (+5%)	⬆️
...ram/encoding/external/ExternalIntegerEncoding.java	100% <0%> (ø)	10% <0%> (+5%)	⬆️
src/main/java/htsjdk/tribble/util/TabixUtils.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
... and 59 more

[lbergelson]

Good idea!