Enhance WAMR_BUILD_SANITIZER to support multiple sanitizers

[kylo5aby]

Support combining compatible sanitizers,
Usage examples:
cmake -DWAMR_BUILD_SANITIZER=ubsan,posan ../
cmake -DWAMR_BUILD_SANITIZER=ubsan ../

[lum1n0us]

A list in cmake is a ; separated group of strings.

I'm not entirely sure if we're following the same approach with command line options, but it seems that ";" is more commonly used than "," in the CMake world for representing a list. I mean -DWAMR_BUILD_SANITIZER=ubsan;posan is more natural and preferable than -DWAMR_BUILD_SANITIZER=ubsan,posan.

https://cmake.org/cmake/help/v3.14/command/list.html#introduction

[kylo5aby]

A list in cmake is a ; separated group of strings.

I'm not entirely sure if we're following the same approach with command line options, but it seems that ";" is more commonly used than "," in the CMake world for representing a list. I mean -DWAMR_BUILD_SANITIZER=ubsan;posan is more natural and preferable than -DWAMR_BUILD_SANITIZER=ubsan,posan.

https://cmake.org/cmake/help/v3.14/command/list.html#introduction

I think while ";" is cmake's internal list separator, "," provides better user experience as it doesn't require shell escaping or quotes. moreover, comma-delimited parameters align with industry conventions used by compilers like gcc/clang: gcc -fsanitize=address,undefined

[lum1n0us]

It appears that it is causing failures in the nightly-run CI. https://github.com/bytecodealliance/wasm-micro-runtime/actions/runs/16867922946/job/47777465384

gcc-4.8: error: unrecognized command line option '-fno-sanitize-recover=all'

Perhaps, if (NOT WAMR_BUILD_SANITIZER STREQUAL "") will be TRUE when (NOT DEFINED WAMR_BUILD_SANITIZER)

[kylo5aby]

It appears that it is causing failures in the nightly-run CI. https://github.com/bytecodealliance/wasm-micro-runtime/actions/runs/16867922946/job/47777465384

gcc-4.8: error: unrecognized command line option '-fno-sanitize-recover=all'

Perhaps, if (NOT WAMR_BUILD_SANITIZER STREQUAL "") will be TRUE when (NOT DEFINED WAMR_BUILD_SANITIZER)

resolved. thanks. #4553