Replace FindKLU with FindSuiteSparse

[pelesh]

Replaced FindKLU.cmake file with a more general FindSuiteSparse.cmake. The new finding function now looks for AMD, COLAMD and KLU libraries. This will be needed for HyKKT integration (currently in works by @shakedregev) as HyKKT links directly to AMD but not KLU. The new finding function can be easily extended to add other libraries from SuiteSparse (I suspect we'll need CHOLMOD soon).

Also changed in this PR -- all external dependencies are off by default. User needs to enable them explicitly now.

This PR is mainly reusing @cameronrutherford's work in GridKit.

[shakedregev]

No comments on the code, I ran it successfully.

[shakedregev]

I just now noticed that make test_install actually fails

/home/szb/ReSolve/install/include/resolve/LinSolverDirectKLU.hpp:3:10: fatal error: klu.h: No such file or directory
    3 | #include "klu.h"
      |          ^~~~~~~
compilation terminated.
gmake[6]: *** [CMakeFiles/consume.exe.dir/build.make:76: CMakeFiles/consume.exe.dir/consumer.cpp.o] Error 1
gmake[5]: *** [CMakeFiles/Makefile2:83: CMakeFiles/consume.exe.dir/all] Error 2
gmake[4]: *** [Makefile:101: all] Error 2
make[3]: *** [examples/CMakeFiles/test_install.dir/build.make:70: examples/CMakeFiles/test_install] Error 2
make[2]: *** [CMakeFiles/Makefile2:732: examples/CMakeFiles/test_install.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:739: examples/CMakeFiles/test_install.dir/rule] Error 2
make: *** [Makefile:322: test_install] Error 2`

[pelesh]

I just now noticed that make test_install actually fails

I can't reproduce this issue and installed ReSolveTargets.cmake looks correct to me. @shakedregev, could you please create an issue and post error output you are getting and the content of the ReSolveTargets.cmake you get installed?