Disable aux stack allocations for threads spawned by wasi_thread_start (#1867)

This syscall doesn't need allocating stack or TLS and it's expected from the application
to do that instead. E.g. WASI-libc already does this for `pthread_create`.

Also fix some of the examples to allocate memory for stack and not use stack before
the stack pointer is set to a correct value.

core/iwasm/libraries/thread-mgr/thread_manager.h

@@ -64,7 +64,7 @@ wasm_exec_env_get_cluster(WASMExecEnv *exec_env);
 
 int32
 wasm_cluster_create_thread(WASMExecEnv *exec_env,
-                           wasm_module_inst_t module_inst,
+                           wasm_module_inst_t module_inst, bool alloc_aux_stack,
                            void *(*thread_routine)(void *), void *arg);
 
 int32