mesa/formatquery: Added queries related to image textures

From the ARB_internalformat_query2 specification:

   "- IMAGE_TEXEL_SIZE: The size of a texel when the resource when used as
      an image texture is returned in <params>.  This is the value from the
      /Size/ column in Table 3.22. If the resource is not supported for image
      textures, or if image textures are not supported, zero is returned.

    - IMAGE_COMPATIBILITY_CLASS: The compatibility class of the resource when
      used as an image texture is returned in <params>.  This corresponds to
      the value from the /Class/ column in Table 3.22. The possible values
      returned are IMAGE_CLASS_4_X_32, IMAGE_CLASS_2_X_32, IMAGE_CLASS_1_X_32,
      IMAGE_CLASS_4_X_16, IMAGE_CLASS_2_X_16, IMAGE_CLASS_1_X_16,
      IMAGE_CLASS_4_X_8, IMAGE_CLASS_2_X_8, IMAGE_CLASS_1_X_8,
      IMAGE_CLASS_11_11_10, and IMAGE_CLASS_10_10_10_2, which correspond to
      the 4x32, 2x32, 1x32, 4x16, 2x16, 1x16, 4x8, 2x8, 1x8, the class
      (a) 11/11/10 packed floating-point format, and the class (b)
      10/10/10/2 packed formats, respectively.
      If the resource is not supported for image textures, or if image
      textures are not supported, NONE is returned.

    - IMAGE_PIXEL_FORMAT: The pixel format of the resource when used as an
      image texture is returned in <params>.  This is the value
      from the /Pixel format/ column in Table 3.22. If the resource is not
      supported for image textures, or if image textures are not supported,
      NONE is returned.

    - IMAGE_PIXEL_TYPE: The pixel type of the resource when used as an
      image texture is returned in <params>.  This is the value from
      the /Pixel type/ column in Table 3.22. If the resource is not supported
      for image textures, or if image textures are not supported, NONE is
      returned."

Reviewed-by: Dave Airlie <[email protected]>

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