Implement funding and watching service over tcp+perun's protobuf encoding.

[manoranjith]

Description

Implement funding and watching service over tcp+perun's protobuf encoding.

Category

Implementation Task

Relevant issue

Testing

Steps to run the tests

Needs to be tested along with an embedded implementation, which will use this API. This will be documented separately.

Checklist

• [x] Name is added to the NOTICE file, if it is not present already.
• [x] Changes are rebased onto the target branch.