feat(metadata): use error codes

[danisharora099]

Problem

Protocols currently use different pattern to handle errors. Light push uses error code while filter uses exception.

It is best for the user if a common pattern is used across the API. Also, there is an opportunity to re-use error code across the codebase and have similar pattern on the user side to handle them

Solution

• Use the same enum that is used for LightPush, for Metadata
• Rename SendError to ProtocolError to be more accomodating

Notes

• Related to https://github.com/waku-org/js-waku/issues/1694

Contribution checklist:

• [ ] covered by unit tests;
• [ ] covered by e2e test;
• [ ] add ! in title if breaks public API;

[danisharora099]

superseded by https://github.com/waku-org/js-waku/pull/1904