Implement async termination of blocking thread (#2516)

Send a signal whose handler is no-op to a blocking thread to wake up
the blocking syscall with either EINTR equivalent or partial success.

Unlike the approach taken in the `dev/interrupt_block_insn` branch (that is,
signal + longjmp similarly to `OS_ENABLE_HW_BOUND_CHECK`), this PR
does not use longjmp because:
* longjmp from signal handler doesn't work on nuttx
  refer to https://github.com/apache/nuttx/issues/10326
* the singal+longjmp approach may be too difficult for average programmers
  who might implement host functions to deal with

See also https://github.com/bytecodealliance/wasm-micro-runtime/issues/1910

core/iwasm/common/wasm_runtime_common.h

@@ -1040,6 +1040,15 @@ WASM_RUNTIME_API_EXTERN bool
 wasm_runtime_is_import_global_linked(const char *module_name,
                                      const char *global_name);
 
+WASM_RUNTIME_API_EXTERN bool
+wasm_runtime_begin_blocking_op(WASMExecEnv *exec_env);
+
+WASM_RUNTIME_API_EXTERN void
+wasm_runtime_end_blocking_op(WASMExecEnv *exec_env);
+
+void
+wasm_runtime_interrupt_blocking_op(WASMExecEnv *exec_env);
+
 #ifdef __cplusplus
 }
 #endif