Implements Profiler server that can perform on-demand profiling on TF eager...

Implements Profiler server that can perform on-demand profiling on TF eager program. It reuse service defined for TPU since we want both TPU and GPU user cand use the same capture_tpu_profile and TensorBoard profile plugin following this instruction: https://cloud.google.com/tpu/docs/cloud-tpu-tools#capture_profile

I will rename TPUProfiler and capture_tpu_profile to more generic names.

PiperOrigin-RevId: 230583138