Define one top-level structure per file

[emmanuelm41]

Let's put every CBOR methods on one lib per actor, and attach them to bytes. We will need to rename the methods too.

Change from this

library MinerAPI {
  // ...
  using GetVestingFundsCBOR for MinerTypes.GetVestingFundsReturn;
  using GetBeneficiaryCBOR for MinerTypes.GetBeneficiaryReturn;
  using ChangeWorkerAddressCBOR for MinerTypes.ChangeWorkerAddressParams;
  using ChangePeerIDCBOR for MinerTypes.ChangePeerIDParams;
  using ChangeMultiaddrsCBOR for MinerTypes.ChangeMultiaddrsParams;
  using GetPeerIDCBOR for MinerTypes.GetPeerIDReturn;
  using GetMultiaddrsCBOR for MinerTypes.GetMultiaddrsReturn;
  using WithdrawBalanceCBOR for MinerTypes.WithdrawBalanceParams;
  using WithdrawBalanceCBOR for MinerTypes.WithdrawBalanceReturn;
  // ...
}

to

library MinerAPI {
  using MinerCBOR for *;
  using AddressCBOR for bytes;
}

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