Extend JS api for segment (groups)

[philippotto]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• create a new volume annotation
• execute this code line by line:

const tracingId = webknossos.apiInterface.data.getVolumeTracingLayerIds()[0];

webknossos.apiInterface.tracing.registerSegment(1, [2712, 2712, 992], null, tracingId)
webknossos.apiInterface.tracing.removeSegment(1, tracingId)
webknossos.apiInterface.tracing.registerSegment(1, [2712, 2712, 992], null, tracingId)
webknossos.apiInterface.tracing.updateSegment(1, {name: "Special Segment"}, tracingId)

webknossos.apiInterface.tracing.createSegmentGroup("Test Group 1", null, tracingId)
webknossos.apiInterface.tracing.createSegmentGroup("Test Group 2", null, tracingId)
webknossos.apiInterface.tracing.createSegmentGroup("Test Group 3", 1, tracingId)
webknossos.apiInterface.tracing.updateSegment(1, {name: "Special Segment", groupId: 2}, tracingId)
webknossos.apiInterface.tracing.updateSegment(1, {name: "Special Segment", groupId: 3}, tracingId)
webknossos.apiInterface.tracing.renameSegmentGroup(1, "New Group Name", tracingId)
webknossos.apiInterface.tracing.deleteSegmentGroup(-1, true, tracingId)

Issues:

• fixes Add segment groups to Frontend-API #7317

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(Please delete unneeded items, merge only when none are left open)

• Updated changelog

[normanrz]

Very nice!