Add inter-temporal-parameters extension to RAO Parameters

[bqth29]

Describe the current behavior

No response

Describe the expected behavior

See #1225 and this comment for more context

For inter-temporality-related features, we will need new parameters (e.g. the number of parallel threads for topological optimization or sensitivity computation). If such a parameter appears during a development, create an inter-temporal-parameters extension to the existing RAO Parameters.

Describe the motivation

No response

Extra Information

JSON sample

{
    "version" : "2.4",
    ...,
    "extensions": {
        "inter-temporal-parameters": { ... }
    }
}

[bqth29]

#1235 added the extension with the parameter sensitivity-computations-in-parallel for setting the number of threads to run parallel sensitivity computations for all timestamps