Resilience input options not handled correctly

[merav-aharoni]

Describe the bug
When one of the resilience_options is passed as input, the Options object created contains only this option and disregards the other default resilience_options.

Steps to reproduce

from qiskit_ibm_runtime import Options
options1 = Options(
            simulator={"noise_model": "aaa"},
        )
print(options1)
options2 = Options(
            resilience={"noise_amplifier": "GlobalFoldingAmplifier"},
        )
print(options2)

Result is:

Options(optimization_level=None, resilience_level=None, max_execution_time=None, transpilation=TranspilationOptions(skip_transpilation=False, initial_layout=None, layout_method=None, routing_method=None, approximation_degree=None), resilience=ResilienceOptions(noise_amplifier='TwoQubitAmplifier', noise_factors=(1, 3, 5), extrapolator='LinearExtrapolator'), execution=ExecutionOptions(shots=4000, init_qubits=True), environment=EnvironmentOptions(log_level='WARNING', callback=None, job_tags=[]), simulator=SimulatorOptions(noise_model='aaa', seed_simulator=None, coupling_map=None, basis_gates=None))
Options(optimization_level=None, resilience_level=None, max_execution_time=None, transpilation=TranspilationOptions(skip_transpilation=False, initial_layout=None, layout_method=None, routing_method=None, approximation_degree=None), resilience={'noise_amplifier': 'GlobalFoldingAmplifier'}, execution=ExecutionOptions(shots=4000, init_qubits=True), environment=EnvironmentOptions(log_level='WARNING', callback=None, job_tags=[]), simulator=SimulatorOptions(noise_model=None, seed_simulator=None, coupling_map=None, basis_gates=None))

Expected behavior
Should be as for other option types.

Suggested solutions
Add line in Options:

_obj_fields: ClassVar[dict] = {
        "transpilation": TranspilationOptions,
        "execution": ExecutionOptions,
        "environment": EnvironmentOptions,
        "simulator": SimulatorOptions,
        "resilience": ResilienceOptions
    }

Additional Information

• qiskit-ibm-runtime version:
• Python version:
• Operating system: