DataBridgesAPI requests library

[ValerioGiuffrida]

Revise the code as a library to get data from the various endpoints.

• manage credentials
• refresh token
• update endpoints dictionary
• extend endpoint methods

Also see #1

[ValerioGiuffrida]

@paololucchino @angeladiperna <- For your information!

@martinig94 thanks for your best effort on this!!

[paololucchino]

Thanks @ValerioGiuffrida for creating this and @martinig94 for the recent additions.

I'm looking into the possibility of automatically creating a complete python client (and potentially other languages too) based on the swagger.json. If curious: https://openapi-generator.tech/docs/installation for info.

I created one based on the swagger in catalog.api.wfp.org in a branch here: https://github.com/WFP-VAM/DataBridgesAPI/tree/use-open-api-generator . I just need to get some credentials to try it out. Will let you know how it goes!