Deprecate SQTagUtil

[magicDGS]

Description

Closes https://github.com/samtools/htsjdk/issues/949

Checklist

• [x] Code compiles correctly
• [x] New tests covering changes and new functionality
• [x] All tests passing
• [x] Extended the README / documentation, if necessary
• [ ] Is not backward compatible (breaks binary or source compatibility)

[codecov-io]

Codecov Report

Merging #1214 into master will increase coverage by 0.006%. The diff coverage is n/a.

@@               Coverage Diff               @@
##              master     #1214       +/-   ##
===============================================
+ Coverage     68.702%   68.708%   +0.006%     
  Complexity      8061      8061               
===============================================
  Files            542       542               
  Lines          32711     32711               
  Branches        5533      5533               
===============================================
+ Hits           22473     22475        +2     
+ Misses          8038      8036        -2     
  Partials        2200      2200

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/htsjdk/samtools/SQTagUtil.java	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
...va/htsjdk/samtools/sra/SRAIndexedSequenceFile.java	62.162% <0%> (-2.703%)	6% <0%> (-1%)
...sjdk/samtools/util/Md5CalculatingOutputStream.java	74.359% <0%> (+7.692%)	8% <0%> (+1%)	:arrow_up:

[lbergelson]

I'm going to merge this as is because I want it to go in at the same time as the other samtag deprecations.

[magicDGS]

Sorry for not answering - I had too much problems last months and I could not focus on this. Thanks for merging!