Add configuration of transcriptTypes and containerTypes to the svg feature rendering #4615
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What this PR does
it creates the notion of explicit "containerTypes" which create multi-row feature rendering, like the gene glyph. it also makes configurable the notion of "transcriptTypes" which was hardcoded to "transcript","primary_transcript", and "mRNA".
Background
This PR helps address concerns in #4599
The issue brought up previous relied on what was basically a bug to allow a GFF with a parent feature with children to be rendered as multiple rows in the output
This multi-row rendering is pretty specialized to "gene" style rendering but worked well for their case
Therefore, this PR proposes "containerTypes" (which render as multiple rows, like the gene glyph) and then also "transcriptTypes" which corresponds with ProcessedTranscript types.
Footnote
It would be good to allow clicking the subrows of these containerTypes (e.g. for a normal gene glyph, click an individual transcript) but that is still an ongoing todo.