Add Protocol 14 support.

[abuiles]

This pull request add support for protocol 14 operations, effects, and new Horizon end-points.

• Add support for claimable balances.
  Extend server class to allow loading claimable balances from Horizon. The following functions are available:

server.claimableBalances();
server.claimableBalances().claimant(claimant);
server.claimableBalances().sponsor(sponsorID);
server.claimableBalances().asset(asset);
server.claimableBalances().claimableBalance(balanceID);

• Add the following attributes to AccountResponse :

  • sponsor?: string
  • num_sponsoring: number
  • num_sponsored: number

• Add the optional attribute sponsor to AccountSigner, BalanceLineAsset, ClaimableBalanceRecord, and OfferRecord .

• Add sponsor filtering support for offers and accounts .

  • server.offers().sponsor(accountID)
  • server.accounts().sponsor(accountID)

• Extend operation responses to support new operations .

  • create_claimable_balance with the following fields:
    • asset - asset available to be claimed (in canonical form),
    • amount - amount available to be claimed,
    • claimants - list of claimants with predicates (see below):
      • destination - destination account ID,
      • predicate - predicate required to claim a balance (see below).
  • claim_claimable_balance with the following fields:
    • balance_id - unique ID of balance to be claimed,
    • claimant - account ID of a claimant.
  • begin_sponsoring_future_reserves with the following fields:
    • sponsored_id - account ID for which future reserves will be sponsored.
  • end_sponsoring_future_reserves with the following fields:
    • begin_sponsor - account sponsoring reserves.
  • revoke_sponsorship with the following fields:
    • account_id - if account sponsorship was revoked,
    • claimable_balance_id - if claimable balance sponsorship was revoked,
    • data_account_id - if account data sponsorship was revoked,
    • data_name - if account data sponsorship was revoked,
    • offer_id - if offer sponsorship was revoked,
    • trustline_account_id - if trustline sponsorship was revoked,
    • trustline_asset - if trustline sponsorship was revoked,
    • signer_account_id - if signer sponsorship was revoked,
    • signer_key - if signer sponsorship was revoked.

• Extend effect responses to support new effects .

  • claimable_balance_created with the following fields:
    • balance_id - unique ID of claimable balance,
    • asset - asset available to be claimed (in canonical form),
    • amount - amount available to be claimed.
  • claimable_balance_claimant_created with the following fields:
    • balance_id - unique ID of a claimable balance,
    • asset - asset available to be claimed (in canonical form),
    • amount - amount available to be claimed,
    • predicate - predicate required to claim a balance (see below).
  • claimable_balance_claimed with the following fields:
    • balance_id - unique ID of a claimable balance,
    • asset - asset available to be claimed (in canonical form),
    • amount - amount available to be claimed,
  • account_sponsorship_created with the following fields:
    • sponsor - sponsor of an account.
  • account_sponsorship_updated with the following fields:
    • new_sponsor - new sponsor of an account,
    • former_sponsor - former sponsor of an account.
  • account_sponsorship_removed with the following fields:
    • former_sponsor - former sponsor of an account.
  • trustline_sponsorship_created with the following fields:
    • sponsor - sponsor of a trustline.
  • trustline_sponsorship_updated with the following fields:
    • new_sponsor - new sponsor of a trustline,
    • former_sponsor - former sponsor of a trustline.
  • trustline_sponsorship_removed with the following fields:
    • former_sponsor - former sponsor of a trustline.
  • claimable_balance_sponsorship_created with the following fields:
    • sponsor - sponsor of a claimable balance.
  • claimable_balance_sponsorship_updated with the following fields:
    • new_sponsor - new sponsor of a claimable balance,
    • former_sponsor - former sponsor of a claimable balance.
  • claimable_balance_sponsorship_removed with the following fields:
    • former_sponsor - former sponsor of a claimable balance.
  • signer_sponsorship_created with the following fields:
    • signer - signer being sponsored.
    • sponsor - signer sponsor.
  • signer_sponsorship_updated with the following fields:
    • signer - signer being sponsored.
    • former_sponsor - the former sponsor of the signer.
    • new_sponsor - the new sponsor of the signer.
  • signer_sponsorship_removed with the following fields:
    • former_sponsor - former sponsor of a signer.

[ire-and-curses]

Reviewed docs, looks good 👍