TuningTool + MeasurementTool configuration simplification

[JeanLucPons]

In order to simplify the configuration and to avoid discrepency, I propose to remove the actuators and observables from TuningTool configuration. Basically in the example bellow, I propose to remove sextu_array_name and chromaticty_monitor_name from the config of DEFAULT_CHROMATICITY_CORRECTION. A TuningTool should retrieve these ids from the response matrix. This would simplify a bit the configuration and especially avoid potential discrepancies between the loaded response and the used TuningTool. When a MeasurementTool save its data, it will include sextu_array_name and chromaticity_name as variable_names and observable_names.

- type: pyaml.tuning_tools.chromaticity_response_matrix
  name: DEFAULT_CHROMATICITY_RESPONSE_MATRIX
  sextu_array_name: Sext
  chromaticity_name: CHROMATICITY_MONITOR
  sextu_delta: 1e-6
- type: pyaml.tuning_tools.chromaticity
  name: DEFAULT_CHROMATICITY_CORRECTION
  chromaticty_monitor_name: CHROMATICITY_MONITOR # To be removed
  sextu_array_name: Sext   # To be reomved
  response_matrix: file:ideal_chroma_resp.json

Actual model of a ResponseMatrixData:

class ConfigModel(BaseModel):
    """
    Base configuration model for response matrix

    Parameters
    ----------
    matrix : list[list[float]]
        Response matrix data (rows for observable, cols for variables)
    variable_names : list[str], optional
        Variable names, basically the actuators
    observables_names : list[str]
        Observable names, basically the measurements
    """

    matrix: list[list[float]]
    variable_names: Optional[list[str]]
    observable_names: list[str]