change logic of attestation issuance, to handle new contract

[divine-comedian]

In the new contract put in place from Giveth/DeVouch-contracts#5 we will need to change how we issue attestations from the front end to interact instead with the new contract, calling certain functions instead of interacting directly with EAS. The new contract will allow us to:

• Collect a small fee on each attestation made
• Allow attesters to issue multiple attestations as either multiple attester orgs and/or for multiple projects
• create delegated attestations so the issuer of the attestation remains the same on-chain
• do it all in a single user transaction 😎

this will likely require us to move away from the easSDK and write custom contract calls to the deployed contract.

Similarly when a user is editing a given attestation they have issued they should also use this new contract.