Add more options for TPU profiling

[qiuminxu]

• Motivation for features / changes
  StartTracing API has more options to config how to profile a model. Add that to the capture profile pop up.
• Technical description of changes

1. Add work_list, num_tracing_attempts and include_dataset_ops to the pop up.
2. Trim the string of the ProfilerServiceAddress to remove leading and trailing spaces.
3. Add auto-validate to the input field.
4. Fix a bug that the "_profilerServiceAddress" should be passed into the shouldDisableCaptureProfileButton instead of the "profilerServiceAddress".

• Screenshots of UI changes
  

• Detailed steps to verify changes work correctly (as executed by you)
  bazel run tensorboard/plugins/profile:profile_demo
  bazel run tensorboard:tensorboard -- --logdir=/tmp/profile_demo

• Alternate designs / implementations considered

[wchargin]

Approved modulo inline. Thanks!