Refactor the Python client

Description

As a user of the python plugin, I want to use the same function as available in the R plugin.

For instance, the functions rdb_datasets, rdb_dimensions and rdb_series are very useful.

Tasks

• list the differences between R and Python client APIs
• make a proposition of evolution for Python client API, to be discussed and validated with the team
• implement it
• create a documentation either in API.md or in a sphinx doc, more idiomatic than a notebook

Resources

• https://cran.r-project.org/web/packages/rdbnomics/news/news.html
• use case: https://cran.r-project.org/web/packages/rdbnomics/vignettes/rdbnomics.html#8_fetch_the_available_datasets_of_a_provider