[Feature]: Connect to data sets end point

[rmbielby]

Description

This should recreate the functionality of:
https://dfe-analytical-services.github.io/eesyapi.R/reference/get_data_catalogue.html

The R code for which is here:
https://github.com/dfe-analytical-services/eesyapi.R/blob/main/R/get_data_catalogue.R

Use case

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Why this is important

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Acceptance criteria

• Function available that retrieves info from the data catalogue endpoint for a given publication ID and returns a data frame of the resulting data set information.
• Appropriate tests to validate functionality

Additional Context

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