Form controls with popups should allow more control over when they open

[joshwooding]

Description

At the moment we have the following behaviour:

Component	Opens on Focus	Opens on Trigger	Opens on change
ComboBox	❌	✅	✅
Dropdown	❌	✅	—
DatePicker	❌	❌	❌

Not showing on focus is consistent across the board and is generally good practice but other behaviours might need to be customised.

Expected behavior

Where possible I should be able to control this behaviour with props e.g.

showOnClick
showOnKeypress
showOnChange

We might not need to support all for now, maybe showOnClick is enough?

Alternatives and examples

.

Context

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