Compact variant for all components

[adidahiya]

@blueprintjs/core

Component	Has compact variant	Prop name (if different from compact)
Breadcrumbs	❌
Button	✅	small
ButtonGroup	✅	small (needs docs)
Callout	✅
Card	✅
CardList	✅
HTMLTable	✅
Menu	✅	small
Navbar	❌
Section	✅
Tree	✅
Checkbox / Radio / Switch	❌
SegmentedControl	✅	small
Slider	❌
InputGroup	✅	small
TextArea	✅	small
FileInput	✅	small
NumericInput	✅	small
Dialog	❌
Drawer	❌
Popover	❌
Toast	❌
Tooltip	✅

@blueprintjs/datetime2

Component	Has compact variant	Prop name (if different from compact)
DatePicker3	❌
DateInput3	❌
DateRangePicker3	❌
DateRangeInput3	❌

@blueprintjs/select

Component	Has compact variant	Prop name (if different from compact)
Select	⚠️	inputProps={{ small: true }} menuProps={{ className: Classes.SMALL }}
Suggest	⚠️	inputProps={{ small: true }} menuProps={{ className: Classes.SMALL }}
MultiSelect	❌
Omnibar	❌

[jessperrin]

Sweet - I feel like we should align on language here, either go with small/default/large or compact/default/large