Moving the HandConstraint Solver from Experimental to Release (#5500) (…

…#5560)

* Moving the HandConstraint Solver from Experimental to Release (#5500)

## Overview
This pull request moves the HandConstraint  (and HandConstraintPalmUp) solver from Experimental to Release by adding tests, documentation, and a handful of bug fixes and improvements. Functionality remains pretty much the same from the previous pull request (#4532) and utilizes solver fixes from @Troy-Ferrell's (#5416)

The solver has also be genericized to work with motion controllers.

Thank you @julenka for guidance on how to write unit tests that utilize hands!

## Changes
- Fixes: #5312, #5304, #5257, #5413


## Commits
* Removing global input handler warning.

* Wip check-in, new rotation behavior.

* Disable hand tracking on hands which are currently focus locked.

* Adding additional hand menu features and documentation improvements.

* Hand constraint example improvements.

* Hacks to get solver to not throw null pointers when instantiated. Should be reverted

* Skeleton test for ensuring hand menu follows hand

* Comment and example improvements.

* autoTransitionBetweenHands is now set via the tracked handness of the solver handler

* Adding support for motion controllers.

* Updating example to support new solver changes.

* Moving hand based menus out of the experimental namespace.

* Adding hand constraint documentation.

* Addressing pr feedback.

* Updating example scene to use "new" toggle buttons.

* Improving documentation, especially around IMixedRealityControllers usage.

* Fixing broken documentation.

* Update Documentation/README_Solver.md

* Update Documentation/README_Solver.md

Co-Authored-By: David Kline <davidkl@microsoft.com>