Add `--trigger-width` support for DatePicker & DateRangePicker (#5895)
* add --trigger-width support for DatePicker & DateRangePicker
* fix comment typos
* simplify width calculations
* Also apply it to the range picker
---------
Co-authored-by: Daniel Lu <dl1644@gmail.com>
Co-authored-by: Robert Snow <rsnow@adobe.com>