New Staking Contract

[felipeasf]

Description

Checklist:

• [x] Pull Request references Jira issue
• [x] Pull Request applies to a single purpose
• [x] I've added comments to my code where needed
• [x] I've updated any relevant docs
• [x] I've added tests to show that my changes achieve the desired results
• [x] I've reviewed my code
• [x] I've followed established naming conventions and formatting
• [x] I've generated a coverage report and included a screenshot
• [x] All tests are passing locally