Add init time profiling draft

[shewu-quic]

This PR is to show some init time related log at runtime.

1. This is all init time on the QnnBackend.
   [Time consuming during init in QnnBackend] Init Time: 219 milliseconds
2. It is generated from qnn profiling.
   QNN (load binary) time includes RPC (load binary) time.
   RPC (load binary) time includes QNN accelerator (load binary) time.
   QNN accelerator (load binary) time includes Accelerator (load binary) time.

[INFO] [Qnn ExecuTorch]: Type: 1002, Init Event Name: RPC (load binary) time, Event Data: 16303 us
[INFO] [Qnn ExecuTorch]: Type: 1003, Init Event Name: QNN accelerator (load binary) time, Event Data: 15899 us
[INFO] [Qnn ExecuTorch]: Type: 1004, Init Event Name: Accelerator (load binary) time, Event Data: 15709 us
[INFO] [Qnn ExecuTorch]: Type: 100, Init Event Name: QNN (load binary) time, Event Data: 53819 us

(refer to qnn docs)
3. This is overall loading time in main.cpp

I 00:00:00.386326 executorch:main.cpp:358] [Time consuming during load() function] init took 383 ms