OHIF V3 MONAI Plugin: Add shortcuts for manual sphere (size inc/dec, change to erase)

[AHarouni]

Is your feature request related to a problem? Please describe. Editing segmentation manually is time consuming. we need shortcuts to make it easier to annotate Describe the solution you'd like

• Please add shortcuts to increase decrease brush size ( xnat ohif used "[" and "]" to increase and decrease the brush size
• please allow to erase by holding down "ctrl" key. so user can erase quickly instead of selecting another tool It is great that user can edit on all 3 views, it would be great if user can track the edits easily without switching the tool
• Allow tracking in the 3 panel view by holding down "shift" key

@sedghi @diazandr3s @tangy5