More file extension associations for GLSL shaders

[farnoy]

The GLSL config is missing some file extensions for new shader stages.

https://github.com/github/linguist/blob/8011321f1394b5c3fc1f8ef242775af640df8f7d/lib/linguist/languages.yml#L1801-L1806

The up to date list of stages is as follows:

    .vert   for a vertex shader
    .tesc   for a tessellation control shader
    .tese   for a tessellation evaluation shader
    .geom   for a geometry shader
    .frag   for a fragment shader
    .comp   for a compute shader
    .mesh   for a mesh shader
    .task   for a task shader
    .rgen    for a ray generation shader
    .rint    for a ray intersection shader
    .rahit   for a ray any hit shader
    .rchit   for a ray closest hit shader
    .rmiss   for a ray miss shader
    .rcall   for a ray callable shader

[Nixinova]

Usage of each of those not already added:

• .comp: 149K+ results
• .mesh: 240K+
• .task: 71K+
• .rgen: 2K+
• .rint: 557
• .rahit: 652
• .rchit: 2K
• .rmiss: 1.2K
• .rcall: 523

[lildude]

.rchit and .rmiss have now been added as part of #5566 . Usage for the others proposed in that PR weren't sufficient for inclusion.

[alexd2580]

I second adding .comp as an extension.
While it is rather generic, it is the official extension name for GLSL compute shaders https://www.khronos.org/opengles/sdk/tools/Reference-Compiler/
The majority of .comp files on GH (14K vs 8K) can be confidently called GLSL because of their use of long specific GLSL keywords like gl_GlobalInvocationID, push_constant:
https://github.com/search?q=path%3A*.comp+%28gl_GlobalInvocationID+OR+gl_LocalInvocationID+OR+gl_NumWorkGroups+OR+gl_WorkGroupSize+OR+local_size_x+OR+push_constant+OR+GL_GOOGLE_include_directive+OR+glsl%29&type=code
The above query has a lot of false negatives, which is fine, given the current state.

[lildude]

@alexd2580 feel free to submit a PR to add support as a generic extension. This will require an accurate heuristic.