[spinel] add support for logging crash dumps (#10061)

This commit adds a new feature that allows platforms to log crash logs.

### Additions
- `void otPlatLogCrashDump(void)` - API that logs a crash dump using
  OpenThread Logging APIs
- `SPINEL_PROP_RCP_LOG_CRASH_DUMP` - spinel prop that calls
  `otPlatLogCrashDump()` when `Set`
- `SPINEL_CAP_RCP_LOG_CRASH_DUMP` - spinel capability denoting that a
  RCP supports logging crash dumps

### Usage
- For `ot-cli-ftd|mtd`, `otPlatLogCrashDump()` is called at the end of
  app initialization, before the main loop. See [main.c]
- For Host/RCP setups, during initialization, the Host gets the RCP
  capabilities. If the RCP has the `SPINEL_CAP_RCP_LOG_CRASH_DUMP`
  capability, the Host will `Set` the `SPINEL_PROP_RCP_LOG_CRASH_DUMP`
  property, triggering the RCP to call `otPlatLogCrashDump()`.
  - If RCP Recovery is enabled, the this will also happen once the RCP
    has been restored

examples/platforms/simulation/misc.c

@@ -31,6 +31,7 @@
 #include <setjmp.h>
 #include <unistd.h>
 
+#include <openthread/logging.h>
 #include <openthread/platform/misc.h>
 
 #include "openthread-system.h"
@@ -108,3 +109,13 @@ otPlatMcuPowerState otPlatGetMcuPowerState(otInstance *aInstance)
 
     return gPlatMcuPowerState;
 }
+
+#if OPENTHREAD_CONFIG_PLATFORM_LOG_CRASH_DUMP_ENABLE
+otError otPlatLogCrashDump(void)
+{
+    otLogCritPlat("LOGGING SIMULATED CRASH DUMP");
+    otLogCritPlat("Reset Reason: %d", sPlatResetReason);
+
+    return OT_ERROR_NONE;
+}
+#endif