fix: TS inheritance error with ProviderInterface

[famouswizard]

Motivation and Resolution

replaced extends with implements since ProviderInterface is an interface, not a class.
using extends caused a TS2689 compiler error. now the class correctly implements the interface and compiles without issues.

RPC version (if applicable)

Usage related changes

Development related changes

Checklist:

• Performed a self-review of the code
• Rebased to the last commit of the target branch (or merged it into my branch)
• Linked the issues which this PR resolves
• Documented the changes in code (API docs will be generated automatically)
• Updated the tests
• All tests are passing