add Experiment manager tools (#34)

* Add Experiment manager tools (Expts_manager.py and Expts_manager.yaml) to automate the setup and management of ACCESS-OM experiments.

* Add a python script (write_Expts_manager_yaml.py) to generate Expts_manager.yaml file.

* Support parameter tuning for both ACCESS-OM2 and ACCESS-OM3, including,
        - MOM6 configurations for ACCESS-OM3.
        - Fortran namelists (e.g., *_in, *.nml) for both ACCESS-OM2 and ACCESS-OM3.
        - Coupling timesteps (nuopc.runseq) for ACCESS-OM3.
        - Component settings (nuopc.runconfig) for ACCESS-OM3.

* Provide the interface for cloning external tools,
        - om3-utils (specific to ACCESS-OM3).
        - make_diag_table for both ACCESS-OM2 and ACCESS-OM3.

* Provide functionalities, including,
        - Control Experiment Setup: Enables modifications of all parameters.
        - Namelist tunning: features three generalized structures:
               - Single parameter tuning within a single file (with options to define perturbation directory names).
               - Multiple parameter tuning within a single file (with options to define perturbation directory names).
               - Multiple parameter tuning across multiple files (requiring definition of perturbation directory names).
        - Run Control: Allows management of control and perturbation experiments, including:
               - Specifying the number of control and perturbation experiments.
               - Options to run namelists.
               - Checking for duplicate PBS jobs.
               - Preventing duplicate restart symlink creation.

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Co-authored-by: Andrew Kiss <[email protected]>