Support stake, unstake, and finalize_unstake pseudo operations in Taquito

[dsawali]

Protocol Oxford will bring forth a feature flag, that when enabled, will allow users to perform stake, unstake, and finalize_unstake pseudo operations on implicit accounts.

Support the 3 pseudo operations in Taquito Contract API.

Implementation Details

Stake, unstake, and finalize_unstake are all considered 'pseudo operations' because they are essentially an extension of the existing transaction operation.

Refer to this document for further details on what that means: https://hackmd.io/@dsawali/H1_vK4t33

Implement a method wrapper in contract API similar to contractCall or setDelegate and registerDelegate. The work will encompass these domains:

• Prepare provider
• RPC contract provider
• Estimate provider
• Local forger

The method wrappers should be callable via the contract API as such:

await Tezos.contract.stake(...);

await Tezos.contract.unstake(...);

await Tezos.contract.finalizeUnstake(...);

note: same application for estimate, and prepare provider

The same goes for wallet API (but need verification on this).

Testing

Write appropriate unit and integration tests. This will be part of the ticket's acceptance criteria.