[DOC] Add example notebook of reading/querying METAR files

[charlesbluca]

Had the chance to chat with @mgrover1 at SciPy 2022, who showed me an interesting use case for dask-sql in exploring and plotting surface observations, which can be read in from METAR files and are typically represented as pandas dataframes. An example of this being done in MetPy's docs:

https://unidata.github.io/MetPy/latest/tutorials/declarative_tutorial.html#plot-surface-obs

This could be a good opportunity to highlight some areas where dask-sql may currently be lacking, and could culminate in an example notebook that could either reside here or in dask-examples.