Add Lizard functionality to hydropandas

[anouksprong]

Functions added to extract metadata and timeseries from a Lizard-API

[dbrakenhoff]

Nice! I've been looking forward to this development!

FYI, you'll want to point the Pull Request to the dev branch. You can modify that by pressing the edit button to the right of the PR title and selecting base: dev.

[OnnoEbbens]

Hi Anouk, I made some changes to the lizard function mostly to make it more uniform with the rest of Hydropandas and some to speed up the code. Some things to note:

• I changed the format of the extent from [xmin, ymin, xmax, ymax] to [xmin, xmax, ymin, ymax] in order to match the existing extent format
• I merged read_lizard_from_extent and read_lizard_from_list into one function read_lizard
• I've added some tests. I did not add tests yet to combine the 'diver' and 'handmetingen' because I don't know which tube has both. Do you have the code of a tube that has both? Than we can test this.
• I really liked the part where you use the ThreadPoolExecutor to do some parallel processing, I might use this for other modules of hydropandas as well.