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

doc/build_wamr.md

@@ -109,6 +109,10 @@ cmake -DWAMR_BUILD_PLATFORM=linux -DWAMR_BUILD_TARGET=ARM
 - **WAMR_DISABLE_STACK_HW_BOUND_CHECK**=1/0, default to enable if not set and supported by platform, same as `WAMR_DISABLE_HW_BOUND_CHECK`.
 > Note: When boundary check with hardware trap is disabled, or `WAMR_DISABLE_HW_BOUND_CHECK` is set to 1, the native stack boundary check with hardware trap will be disabled too, no matter what value is set to `WAMR_DISABLE_STACK_HW_BOUND_CHECK`. And when boundary check with hardware trap is enabled, the status of this feature is set according to the value of `WAMR_DISABLE_STACK_HW_BOUND_CHECK`.
 
+#### **Disable async wakeup of blocking operation**
+- **WAMR_DISABLE_WAKEUP_BLOCKING_OP**=1/0, default to enable if supported by the platform
+> Note: The feature helps async termination of blocking threads. If you disable it, the runtime can wait for termination of blocking threads possibly forever.
+
 #### **Enable tail call feature**
 - **WAMR_BUILD_TAIL_CALL**=1/0, default to disable if not set