Wrap RenderArea creation in a builder pattern

Use a builder to pass around parameters used for RenderArea
creation. This allows more flexibility for when the RenderArea
is created, which aids in the overall goal of reducing the
number of SF main thread hops during screenshots. Creating a builder
will allow the render area to later be passed into
captureScreenCommon() without being wrapped in a future.

Bug: b/294936197
Test: atest SurfaceFlinger_test
Change-Id: I9545e02af42c7e6cd9b0c328e2ecce995811f2d7