- Moved the R11G11B10F conversion code from the Blitter to
  ShaderCore
- Used the conversion code in PixelRoutine where appropriate
  to make the R11G11B10F work as a renderable format
- Added the VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT and
  VK_FORMAT_FEATURE_BLIT_DST_BIT to the
  VK_FORMAT_B10G11R11_UFLOAT_PACK32 format

This allows ANGLE to expose the GL_EXT_color_buffer_float
(and GL_EXT_color_buffer_half_float, which depends on
GL_EXT_color_buffer_float in ANGLE, due a driver issue).

Bug: b/146223877
Tests: dEQP-VK.*b10g11r11*
Change-Id: I04ad29f7b7d497705186ae290a05868abfc13c42
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39550
Presubmit-Ready: Alexis Hétu <sugoi@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>