[Runtime Context] Implement a thread-level-singleton WASMRuntime #4283
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Plan to replace process-level global variables with thread-local variables. The reason for not using the variable attribute
__threadis due to concerns that it is a GCC extension and requires significant support from the linker (ld), dynamic linker (ld.so), and system libraries (libc.so and libpthread.so), making it not available everywhere.Plus, memory initialization