Support for HoloLens 2 Reading Mode

Describe the problem

Reading Mode as implemented in MRTK v2 is incompatible with URP. This would be a great fit for an MRGT feature, as it is a low level (and possibly "accessibility"-related feature) tied to render features and overall graphical quality of the MR app.

Describe the solution you'd like

Some sort of opt-in URP render feature thingy that enables Reading Mode!

Describe alternatives you've considered

Not using URP :(

Additional context

MRTK issues: https://github.com/microsoft/MixedRealityToolkit-Unity/issues/10337, https://github.com/microsoft/MixedRealityToolkit-Unity/issues/8344, https://github.com/microsoft/MixedRealityToolkit-Unity/pull/8651, https://github.com/microsoft/MixedRealityToolkit-Unity/pull/8808

Reading mode info: https://docs.microsoft.com/en-us/hololens/hololens2-display#what-improvements-are-coming-that-will-improve-hololens-2-image-quality

まず、リンクされている MRTK の issue と pull request を確認し、次にリンクされている HoloLens 2 Reading Mode の情報を読み、リポジトリの Unity グラフィックスコンポーネントを調査します。オプトイン可能な Unity URP render feature が HoloLens 2 Reading Mode をサポートし、期待される画質の動作がドキュメント化またはテストされていれば完了です。