SPARQL only notebook

**Is your feature request related to a problem? Please describe.**
As a user who is only writing SPARQL queries, it is frustrating to have to create a new python3 notebook and use the %%sparql magic in every cell.

**Describe the solution you'd like**
I would like the option to create a New -> SPARQL notebook and have that notebook implicitly know every cell is a SPARQL query without me specifying the magic.

**Describe alternatives you've considered**
I am not sure of any alternatives other than typing %%sparql in every cell. It may be enough if the notebook automatically populates the last used cell magic at the top of every new cell.

**Additional context**