Package Refactorization

[kuzdogan]

Wrapper issue for the ongoing npm package development and refactorization of the Sourcify code accordingly.

The goal is to separate the Sourcify functionality, mainly the verification, into a reusable npm library lib-sourcify. This would enable other applications to easily verify contracts given the metadata+source files, and return a Match.

Then the Sourcify server becomes a wrapper around lib-sourcify for different chains, and saves and serves the contract source files.

Non-exhaustive list of tasks, add tasks as they become apparent through the development:

• [ ] Write tests for the lib-sourcify package. These should cover the existing ones in the server tests for edge cases such as immutable+factory contracts.
• [ ] Write tests for the server verification service API endpoints.
• [ ] Write tests for the server repository service API endpoints.
• [ ] Add test coverage reports in README for lib-sourcify, server and monitor code.
• Move the src/ into a server/ folder and move server-only dependencies into its server/package.json

_{View in Huly HI-360}

[kuzdogan]

Closing as completed. Testing related todos will follow up with the coverage report: #937