[HW] Grove Dual and LED Button Module as Shield

[rexut]

          

Is this request related to a missing driver support for a particular hardware platform, SoC or board? Please describe.
I need support for more Grove button and LED modules as shields. The following shield should be supported:

• Grove Dual-Button, combines two push buttons with negative logic (low active)
• Grove LED-Button, combines one LED with positive logic (high active and one push button with negative logic (low active)

In this early first stage the Zephyr upstream samples "Blinky", "Fade" and "Button" should be usable.

Describe why you are asking for this support?
With this support the board+shield variation for Grove based systems will scaling up.

I'm preparing a changeset for PR. I'll maintain the new modules for Bridle and later contribute and maintain to/in Zephyr upstream.

Additional context
The new shields support will coming together with Grove connector support as currently provided by Bridle only.

The Grove Button Shields will get additional support for inverted inputs on push buttons, negative logic (low active).