* Convert relative effect cycling to absolute effect selection.

* Use Zephyr auto CCC discovery instead of doing it ourselves.
* Split service versus characteristic discovery into dedicated
  steps in the flow.
* Fix for not searching properly when connecting to a peripheral
  a second time.

* GATT characteristic allowing passng data + behavior
  label to invoke the behavior on the peripheral side.
* Behaviors have a locality setting to specify where they run.
* Build reset/power/RGB on peripheral.

This is a generalization of the existing concept of tri-layer support
that's already well known. Essentially, a conditional-layer
configuration activates a particular layer (the then-layer) when one or
more other layers (the if-layers) are activated.

This is commonly used on ortho keyboards to activate a third "adjust"
layer while the primary two layers ("lower" and "raise") are active.

Implements new hold/tap flavor, tap-unless-interrupted
Adds tests
Adds docs

* Handle disconnects of peripherals, and properly clean up
  and resume discovering for when the peripheral re-appears.

Co-authored-by: jding <jding@roblox.com>

* Add optional `hold-trigger-key-positions` hold-tap configuration
* Leverage configuration for decision making around when to trigger
  hold decision in hold-taps.
* Add docs for new configuration.
* Tests for the new config/decision logic. 

Now that PR #506 is merged, we can address this TODO.