feat!: Improve search/find methods

[barreeeiroo]

Fixes

While integrating Payment Rails API with this library, I realized there are quite a few things missing. Mainly, the search (or find) methods have lots of attributes missing, and as we needed a way to get a specific recipient by email address, we decided to modify the SDK a little bit.
The new UrlUtils class provides a method to automatically get all Python method parameters and convert them into a Payment Rails API equivalent. There is an example available at RecipientGateway.search: the only condition is that Python method attributes name have to match with PR API ones.

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

[barreeeiroo]

For example, in the following piece of code:

g = RecipientGateway(None, None)
g.search(page_size=15, email="diego@kodular.io")

the endpoint variable in RecipientGateway.search value will be /v1/recipients?pageSize=15&email=diego%40sdc.gal