Add an LTC fitting tool and supporting all the BRDFs available in HDRP. (#3957)

* Implement  and LTC Fitting tool.

* Changelog

* Update LTCTableGeneratorEditor.cs

* Rename param

* Formatting

* Added licence, update doc and hide tool access

* update references screenshots

* Update 2405_EnlightenDynamicAreaLights.png

* Added 1451_AxF_AreaLights and modified 2402_Area_Rect_Shadows

* Added scene in build settings

* Adress doc feedback

* Formatting

* Update screenshots for 1451 and fix issue on 2402 scene.

* update reference screenshots

Co-authored-by: sebastienlagarde <[email protected]>
Co-authored-by: Remi Chapelain <[email protected]>

Author: 3 people

TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/1x_Materials/1351_Fabric_Area_Light.unity

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