Update RenewalInfo Model

[nik3212]

This issue is meant to be a good first issue to get into coding, and into open source contribution over all, as it will require to touch few existing files, is a small change and is documented extensively. If you are new to coding, I encourage you to try this issue.

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Feature description
Update RenewalInfo model by adding the new fields currency and renewalPrice according to the documentation.

Documentation.

Describe the solution you'd like
Extend the IRenewalInfo protocol by adding the new fields and update dependent models.