Implements Vulkan's 'fillModeNonSolid' feature.

Mostly a copy-and-paste of src/Renderer logic. It sets the batch size
for non-solid triangles to 1 so their edges or vertices can get
individually rasterized as lines or points.

Bug: b/139872671
Tests: dEQP-VK.rasterization.culling.*
Change-Id: Ifbae8dad32e8b43159fee459c75d7e593fc08041
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/35031Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>