Taquito/rpc: Support "used and paid storage space" endpoints

[roxaneletourneau]

Is your feature request related to a problem and use case? Please describe.
There are new RPC endpoints to retrieve the used and paid storage space of a contract.

Describe the solution you'd like

• Add new methods for the 2 following endpoints in the RpcClient class (corresponding interface and other classes implementing the interface):
  • context/contracts/{contract_id}/storage/paid_space
  • context/contracts/{contract_id}/storage/used_space
• Complete the following test with assertions regarding the expected storage: https://github.com/ecadlabs/taquito/blob/master/integration-tests/contract-increase-paid-storage-operation.spec.ts
• Add integration tests in the following file as well: https://github.com/ecadlabs/taquito/blob/master/integration-tests/rpc-nodes.spec.ts

Additional context
https://gitlab.com/tezos/tezos/-/blob/master/docs/api/lima-openapi.json#/default/get_context_contracts__contract_id__storage_paid_space

[roxaneletourneau]

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