Add feature: "Verified user can request payment from friend"

[abhi3700]

Description

This PR adds the key changes on top of branch: add-faucet that is pending for merge in PR #29 .

This feature contains a contract - SendersTreasury, the code (contract & its tests, deploy scripts) of which is available in this repo: subspace-evm-contracts. The contract is deployed at 0xC74aF26d9195c9c521D47BD305e1119d10139003 on Nova domain of Gemini-3g testnet.

Key changes

• added related functions for any verified Auto user to request payment from a friend. Also, the balance holder can sign the payment onchain.

  TODO: Later on, some of the functionalities would be taken offchain like signing the requested payment details & sending that offchain via backend API in public for the requester to use & claim payment.

• added SendersTreasury contract ABI.
• updated SENDERS_TREASURY_ADDRESS contract address with modified code. Commit url: https://github.com/subspace/subspace-evm-contracts/commit/2ec641815dbc73ac4e02a704e41253f783699503
• code refactoring via abstracting the common code snippet related to recover seed phrase & checking auto ID verification.

[abhi3700]

Already covered in PR #31 to leave the footprint for this feature.

Merging in sequence.