[New] DataDownloader(database=["mkp"]) to download Monkeypox data

[lisphilar]

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Summary

We can add functionality to download Monkeypox data.

Monkeypox Data provided by "Our World In Data"
https://github.com/owid/monkeypox
https://ourworldindata.org/monkeypox

Citation (Licence: CC BY 4.0)
Edouard Mathieu, Fiona Spooner, Saloni Dattani, Hannah Ritchie and Max Roser (2022) - "Monkeypox". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/monkeypox' [Online Resource]

Variables:

• ISO3 codes
• Dates
• Cumulative number of confirmed cases
• Cumulative number of fatal cases

Solutions

NA

APIs to be deprecated

NA

Additional Context

Global Health:
globaldothealth/monkeypox#177 (comment)

[lisphilar]

Downloadable CSV files are available in WHO web site, but I could not find APIs.
https://worldhealthorg.shinyapps.io/mpx_global/

Python script of "Our World In Data" uses URL of WHO, but indirect downloading is safe for us because th URL may be changed later (actually URL not found in any sites for me).
https://github.com/owid/monkeypox/blob/f9edbf65889846db14b25f187f8a164df0fe7425/src/monkeypox.py#L6