Add One Way Collision for 2D Physics tests

[pouleyKetchoupp]

Update 2D Physics tests with a new demo to test one way collision.

This test scene is inspired by the "Around the Clock" test made by @madmiraal in https://github.com/madmiraal/godot-gym in order to test this PR: godotengine/godot#42574

Like the original test, it allows testing collision between a rigid/kinematic body object and a one-way collision platform at different angles.

This new version is a bit different to be able to use it in a more practical way within the physics test framework:

• There are options and sliders to set different test cases (kinematic or rigid body, platform size, etc.)
• You can still test all angles around the clock, but you can also test only one particular case for debug purpose
• When all angles have been tested, the log gives you information about which sets of parameters have failed
• Only the platform rotates for "around the clock" test and the rigid body goes horizontally to avoid redundant cases

Overall, the idea is to be able to test a set of parameters in less than a minute, check the log for failed cases and test these failed cases easily.

@madmiraal I think it covers the same cases as your original test, but if you have some time to have a look, please let me know in case I overlooked something.

[pouleyKetchoupp]

Thanks @aaronfranke! I've updated the test from all your suggestions.

[pouleyKetchoupp]

I've just added proper support for KinematicBody2D, and key shortcuts.