Qiskit / qiskit-ibm-runtime / 35886641595

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Client side estimator package tweaks (#3369)

### Summary

Minor tweaks to the `executor_estimator` package:
* move `estimator_options_to_boxing_options()` to `utils`, on account
for it being arguably a one-liner when collapsed and with similar
notability to the rest of the functions (so we avoid one module)
* flatten the names of the modules that are useful for one method
(`trex_setup.py` -> `trex.py`; `pec_utils.py` -> `pec.py`), for some
more terse names and expanding their scope (as in, everything needed
specifically for a method, goes into them)
* some minor docstring revision

### Details and comments

Related to #3073 

### AI/LLM disclosure

- [x] I didn't use LLM tooling, or only used it privately.

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