Merge client & server

[brech1]

Description

This PR simplifies the project structure and establishes a new way of interacting with the protocol.

• Solves #186

Changes

• The server crate has been removed. The project no longer has a HTTP server implementation.
• The attestation proof generation functionality has now been moved to the client directory.
• There is a new client CLI command: generate-proof. This will fetch every attestation from the contract, generate a proof and store it into a file.
• The verify command has now been updated to load the proof from the file instead of fetching it from the server.
• The README has been updated to describe this new functionality.
• It also include some minor fixes.

[lazovicff]

Whats the reasoning behind attestation.rs inside manager folder. The Attestation is used both in Manager and the EigenTrustClient?

Btw, we could rename EigenTrustClient to Client.

[brech1]

Whats the reasoning behind attestation.rs inside manager folder. The Attestation is used both in Manager and the EigenTrustClient?

Btw, we could rename EigenTrustClient to Client.

It was inherited from the server structure, but it makes sense for attestation to be it's own module. I'll submit a fix for this, including the renaming of EigenTrustClient.