#290: Edge Sub Label

[AntonJames-Sistence]

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Edges didn't have a subLabel

Issue Number: #290

What is the new behavior?

Now we have an optional prop to add a subLabel and display it under or over the Edge label

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[SerhiiTsybulskyi]

LGTM in general, left one comment

[amcdnl]

Overall good - just a few minor suggestions