Filament Release Notes log

If you are merging a PR into main: please add the release note below, under the Release notes for next branch cut header.

If you are cherry-picking a commit into an rc/ branch: add the release note under the appropriate header in RELEASE_NOTES.md.

Release notes for next branch cut

engine: Added parameter for configuring JobSystem thread count
engine: In Java, introduce Engine.Builder
gltfio: fix ubershader index for transmission&volume material
engine: New tone mapper: AgXTonemapper.
matinfo: Add support for viewing ESSL 1.0 shaders
engine: Add support for stencil buffer when post-processing is disabled (Metal backend only).
engine: Add Renderer::getClearOptions() [b/243846268]
engine: Fix stable shadows (again) when an IBL rotation is used