Add tests for FastNoiseLite/NoiseTexture

[Geometror]

This PR implements a test suite for the noise module while fixing some minor bugs (primarily with seamless noise generation).

Detailed changes:

• Implement a test suite for FastNoiseLite and NoiseTexture2D
  • There are some macros and utility function which might be worth to be extracted in test_utils.h or test_macros.h (and generalized), but because they are currently just needed by these tests I left them in test_fastnoise_lite.h
• Stabilize seamless noise texture generation
  • Fix artifacts with small resolutions combined with a small blend skirt value, e.g. 1x32, 16x16 pixels
  • Fix Executing NoiseTexture._generate_texture crashes Godot #61044
  • Remove the provisional restriction of 0.05 for the blend skirt (now it can be set as low as 0)

There are still some small structural quirks in the noise module (e.g. the private method _generate_texture shouldn't be exposed and rather replaced with another solution, because right know it just returns the generated image without setting it internally so it is generated twice). But that's for another PR.

[TokisanGames]

-ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "seamless_blend_skirt", PROPERTY_HINT_RANGE, "0.05,1,0.001"), "set_seamless_blend_skirt", "get_seamless_blend_skirt");
+ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "seamless_blend_skirt", PROPERTY_HINT_RANGE, "0,1,0.001"), "set_seamless_blend_skirt", "get_seamless_blend_skirt");

Did you verify that values between 0 and 0.05 do something and provide a useful range rather than dead space on the slider? This looks like something I would have cut off if it was useless. But it was a long time ago.

[Geometror]

Rebased after the copyright header adjustment.
@TokisanGames You mind find values below 0.05 useful when working with large, high-frequency noise textures (since the blend skirt has to be adjusted inversely proportionally to the frequency for it to be the least recognizable, at least for some noise types). 0.05 was just an experimentally/arbitrarily chosen limit because the implementation couldn’t handle values very close to zero initially.

[akien-mga]

Thanks!