Add a "Enable Denoiser" render settings

**Describe the feature you'd like**
We want to add a convenient denoiser toggle, so it can be toggled in the Solaris viewport

**Describe the solution you'd like**
Follow the current design of the GPU toggle - a render setting like `enable_denoiser`. Then in _SetRenderSetting we detect that and create a denoiser imager chain

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.

Start by finding the existing GPU render-setting handling and the _SetRenderSetting entry point. Follow how the GPU toggle is exposed in the Solaris viewport, then add the enable_denoiser setting so it creates the denoiser imager chain; done means the toggle works in the viewport.

Written by the indexing model from the issue text.