Implement wasi clock_time/clock_res get (#2637)

Add os_clock_res_get and os_clock_time_get in platform_api_extension.h,
and implement them in posix like platforms and windows platform.

core/shared/platform/common/posix/posix_clock.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2023 Amazon Inc.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+#include "platform_api_vmcore.h"
+
+#define NANOSECONDS_PER_SECOND 1000000000ULL
+
+static bool
+bh_clockid_to_clockid(bh_clock_id_t in, clockid_t *out)
+{
+    switch (in) {
+        case BH_CLOCK_ID_MONOTONIC:
+            *out = CLOCK_MONOTONIC;
+            return true;
+#if defined(CLOCK_PROCESS_CPUTIME_ID)
+        case BH_CLOCK_ID_PROCESS_CPUTIME_ID:
+            *out = CLOCK_PROCESS_CPUTIME_ID;
+            return true;
+#endif
+        case BH_CLOCK_ID_REALTIME:
+            *out = CLOCK_REALTIME;
+            return true;
+#if defined(CLOCK_THREAD_CPUTIME_ID)
+        case BH_CLOCK_ID_THREAD_CPUTIME_ID:
+            *out = CLOCK_THREAD_CPUTIME_ID;
+            return true;
+#endif
+        default:
+            errno = EINVAL;
+            return false;
+    }
+}
+
+static uint64
+timespec_to_nanoseconds(const struct timespec *ts)
+{
+    if (ts->tv_sec < 0)
+        return 0;
+    if ((uint64)ts->tv_sec >= UINT64_MAX / NANOSECONDS_PER_SECOND)
+        return UINT64_MAX;
+    return (uint64)ts->tv_sec * NANOSECONDS_PER_SECOND + (uint64)ts->tv_nsec;
+}
+
+int
+os_clock_res_get(bh_clock_id_t clock_id, uint64 *resolution)
+{
+    clockid_t nclock_id;
+    if (!bh_clockid_to_clockid(clock_id, &nclock_id))
+        return BHT_ERROR;
+    struct timespec ts;
+    if (clock_getres(nclock_id, &ts) < 0)
+        return BHT_ERROR;
+    *resolution = timespec_to_nanoseconds(&ts);
+
+    return BHT_OK;
+}
+
+int
+os_clock_time_get(bh_clock_id_t clock_id, uint64 precision, uint64 *time)
+{
+    clockid_t nclock_id;
+    if (!bh_clockid_to_clockid(clock_id, &nclock_id))
+        return BHT_ERROR;
+    struct timespec ts;
+    if (clock_gettime(nclock_id, &ts) < 0)
+        return BHT_ERROR;
+    *time = timespec_to_nanoseconds(&ts);
+
+    return 0;
+}