SampleSDF operator (#88)

* Operator creation, does NOT sample an SDF

* First implementation of the sampleSDF operator, might not be optimised

* Delete VFXExpressionSampleSDF.cs

* Updated Test Graph

* Better handling of out of bounds queries for normals and distances

* Delete HDRenderPipelineEditorResources.asset

* Delete XRPackageSettings.asset

* Assumption that the SDF is baked in the world space, in a box matching the orientedBox given as input

* Update 27_SampleSDF.vfx

* Update 27_SampleSDF.vfx

* restored the deleted asset

* Enforces and apply the 4 parents max rule

* Removes the return statements in branch

* Revert "restored the deleted asset"

This reverts commit 57757b5a3ed4c303c34dc7dc920ad6d0328fcfdb.

* Revert "Revert "restored the deleted asset""

This reverts commit 7753b4e85aba5d75e8af659aedc66515a0c56e20.

* Fix compilation error and warnings

* Fix Pascal case

* Fix Pascal. Really.

* Revert "Revert "Revert "restored the deleted asset"""

This reverts commit daf8b79a78f55b47b6bd85afd9008a57d96f50f1.

* Uses the Inverse-Transpose matrix for SDF related normal transformations (for non uniform scaling)

* Delete packages-lock.json

* Revert "Delete packages-lock.json"

This reverts commit 4a10123f3171d6cf981c5effa52128ebb1411735.

* Revert "Revert "Delete packages-lock.json""

This reverts commit 84d700f0f1fde91d4ad5a6ab87f3946216f883f4.

* Restore this mistakenly modified file

* Update 27_SampleSDF.vfx

* Get rid of useless transpose

* Added Graphic Test

* Added reference images

* Fix incorrect out-of-bounds check  + auto recompile

* Added reference images

* Clarify the name of the output

Author: ludovic-theobald