Apply clang-format for core/iwasm/compilation and core/iwasm/libraries files. Add wasm-c-api empty_imports sample to workflow test. And enable triggering workflow when core/config.h changes.
The feature is disabled by default, to enable it, please use `cmake -DWAMR_BUILD_JIT=1 -DWAMR_BUILD_LAZY_JIT=1` to build iwasm.