Fragment shading rate dynamic sample: Add shaders to CMake setup

[SaschaWillems]

Description

This PR adds the shader files for the fragment shading rate dynamic sample to the CMakeLists.txt. That way, shaders will be compiled as part of the project just like the other samples. Also adds precompiled SPIR-V.

Replaces #1480

General Checklist:

Please ensure the following points are checked:

• My code follows the coding style
• I have reviewed file licenses
• I have commented any added functions (in line with Doxygen)
• I have commented any code that could be hard to understand
• My changes do not add any new compiler warnings
• My changes do not add any new validation layer errors or warnings
• I have used existing framework/helper functions where possible
• My changes do not add any regressions
• I have tested every sample to ensure everything runs correctly
• This PR describes the scope and expected impact of the changes I am making

Note: The Samples CI runs a number of checks including:

• I have updated the header Copyright to reflect the current year (CI build will fail if Copyright is out of date)
• My changes build on Windows, Linux, macOS and Android. Otherwise I have documented any exceptions

[gary-sweet]

Not supported for me, but it's a trivial change