Show erc20next status in golemsp

[kamirr]

erc20next status is currently not used anywhere. While usage in agent/SDK is far off, to ensure that the feature is visible (in a useful way at that) we could display the status in golemsp. While statuses regarding outgoing transactions would be obviously useless for most providers, erc20next will also be responsible for verifying transactions, which can result in InvalidChainId status when trying to verify transaction on an unconfigured chain. Some providers may also wish to act as requestors, in which case they get a payment dashboard for free.

Acceptance criteria:

• Expose erc20next status via REST.
  • Update ya-client spec.
  • Update ya-client Rust API.
  • Implement endpoint in yagna.
• Extend yagna payment status for checking the driver status.
• Display status in golemsp.