Adds GetCurrentOperatorIndex to micro_interpreter

[DanieleParravicini-Synthara]

In this way an AOT can add metadata that could then be accessed with the couple GetCurrentSubgraphIndex, GetCurrentOperatorIndex. These can be accessed from tflite::GetMicroContext(context)->graph()

Refers to #2593 BUG=#2593

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[DanieleParravicini-Synthara]

Hello @rascani, Hope that everything is right. What do you think, is it a good starting point?

On a side note, I see that the CLA is in place, but the CI fails. However, I am not so versed in github actions, but I guess it is missing the label to go further right?

[rascani]

Hello @rascani, Hope that everything is right. What do you think, is it a good starting point?

On a side note, I see that the CLA is in place, but the CI fails. However, I am not so versed in github actions, but I guess it is missing the label to go further right?

Looks good to me. I think the CI failure was just due to a flaky synchronization issue. I've triggered another run.

[rascani]

@DanieleParravicini-Synthara - Looks like the only failing check is the code style check. I can fix that up if I have permission to modify your branch, or you can do it by running:

tensorflow/lite/micro/tools/ci_build/test_code_style.sh --fix_formatting

[DanieleParravicini-Synthara]

run, reformatted and rebased