Review existing "read" interfaces as a first step in designing a new one

[tfenne]

Here are pointers to a few "Read" like interfaces that we might consider when discussing how we want to make a better interface for SAMRecord:

1. HSJDK's SAMRecord
2. GATK 4's GATKRead
3. fgbio's SamRecord trait
4. @magicDGS's existing PR in htsjdk
5. pysam's API which largely mirrors htslib's I believe, but has easier to read docs

[magicDGS]

Should we start better with a PR implementation and discuss there (similar to your low-level IO PR?)

[magicDGS]

Also important to check @tfenne's PR in htsjdk about naming/docs for accessors/mutators.