[Paris] new adaptive issuance rpc endpoints (staker related)

[Innkst]

1. Add support for the following adaptive issuance staker related rpc entrypoints to Taquito RPCClient:

• priority:

• /context/contracts/{contract_id}/full_balance - Access the full balance of a contract, including frozen bonds and stake.
• /context/contracts/{contract_id}/staked_balance - Access the staked balance of a contract. Returns None if the contract is originated, or neither delegated nor a delegate.
• /context/contracts/{contract_id}/unstaked_finalizable_balance - Access the balance of a contract that was requested for an unstake operation, and is no longer frozen, which means it will appear in the spendable balance of the contract after any stake/unstake/finalize_unstake operation. Returns None if the contract is originated.
• /context/contracts/{contract_id}/unstaked_frozen_balance - Access the balance of a contract that was requested for an unstake operation, but is still frozen for the duration of the slashing period. Returns None if the contract is originated.
• /context/contracts/{contract_id}/unstake_requests - Access the unstake requests of the contract. The requests that appear in the finalizable field can be finalized, which means that the contract can transfer these (no longer frozen) funds to their spendable balance with a [finalize_unstake] operation call. Returns None if there is no unstake request pending.

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• optional:

• /context/contracts/<contract_id>/estimated_own_pending_slashed_amount - Returns the estimated own pending slashed amount (in mutez) of a given contract.
• /context/contracts/{contract_id}/balance_and_frozen_bonds - Access the sum of the spendable balance and frozen bonds of a contract. This sum is part of the contract's stake, and it is exactly the contract's stake if the contract is not a delegate.
• /context/contracts/{contract_id}/frozen_bonds - Access the frozen bonds of a contract.
• /context/contracts/{contract_id}/staking_numerator - Returns an abstract representation of the contract's total_delegated_stake.

2. Make sure integration tests are created and passing