Use new Fusion nomenclature recommendations

[creisle]

The current mavis fusion/breakpoint notation was based off of the cytogenic descriptions previously used by HGVS

The new fusion recommendations are potentially simpler

• https://varnomen.hgvs.org/bg-material/consultation/svd-wg007/

Instead of using the bracket notation we would simply split the breakpoints with a double colon.

This will require updates to the parser as well as a data migration to the existing data in out production graphkb instance.

Some examples of the notation migration are in the table below

old notation	new notation
(FEATURE1,FEATURE2):fusion(e.3,e.2)	FEATURE1:e.?_3::FEATURE2:e.2_?
(FEATURE1,FEATURE2):fusion(e.3,e.2)ATGC	FEATURE1:e.?_3::ATGC::FEATURE2:e.2_?

Since this new notation does not support including a "type" field we may still need to use an augmented form but would be good to be closer to the current specification