Extend default shortcuts of date range picker with MTD and YTD

[severinlandolt]

Environment

Package version(s): Latest Blueprint version
Browser and OS versions: Latest Chrome version

Feature request

It would be great to extend the default shortcuts of the date range picker with the following options:

• MTD: Month-to-date
• YTD: Year-to-date

Examples

MTD: Today is April 24th, 2022. The month-to-date option would include the range from 01-04-2022 to 24-04-2022.
YTD: Today is April 24th, 2022. The year-to-date option would include the range from 01-01-2022 to 24-04-2022.

[adidahiya]

This is very similar to a previous request: #4398

Adding MTD and YTD is currently possible, all you have to do is set the shortcuts prop on DateRangeInput or DateRangePicker.

However, it's not very easy to extend the set of default shortcuts, because we don't expose those in the public API:

blueprint/packages/datetime/src/shortcuts.tsx

Line 130 in 85dab97

function createDefaultShortcuts(

I'd be open to an API improvement which makes it easy to extend the default set instead of overriding the default shortcuts.