Spike: Payment channel authorization grants

[branimirangelov]

Within the current PoC, implement extension on the Base Protocol layer to enable the creation of payment channels under another payment channel on user (client) behalf. The authorization should be stored in the Payment.sol and there should be ways for creating / destroying delegated channels (upon authorization pre-check). The exchange of the authorization grants between kubernetes and smart contract layer is in extending / using the mechanisms around getOrCreateToken in interceptors.go.

Important constraints:

1. The payment channel should be always between the user (client) and hardware provider (not brokege).

References:

1. Payment.sol: https://github.com/comrade-coop/apocryph/blob/master/contracts/src/Payment.sol
2. getOrCreateToken (in interceptors.go): https://github.com/comrade-coop/apocryph/blob/master/pkg/proto/protoconnect/interceptors.go

Note: This spike is part of the Autoscaler autonomous application effort.