[ENH] refactor write_to_tsfile to use `n_timepoints` instead of `series_length`

[TonyBagnall]

Describe the feature or idea you want to propose

some time ago we agreed on calling the shape of collections of time series (n_cases, n_channels, n_timepoints). Some classes and functions still use series_length instead of n_timepoints , which is fine, but we would like to standardise. For example, the function _write_data_to_tsfile in datasets._datawriters internally used series_length

Describe your proposed solution

refactor this function so that it uses a local variable n_timepoints instead of series_length

Describe alternatives you've considered, if relevant

No response

Additional context

No response

[Neelaksh-Singh]

Hi, I would like to take up this issue.

[harshithasudhakar]

Hi, is the issue still open? the issue seems fixed.

[TonyBagnall]

yes its fixed