Claimable Balance and Asset Summary Changes

[paulbellamy]

The following changes to claimable balances, and assets endpoints were recently released in Horizon 2.2.0:

• The Asset object now includes the following new fields, with examples:

      ...
       "accounts": {
          "authorized": 23,
          "authorized_to_maintain_liabilities": 11,
          "unauthorized": 6
        },
        "num_claimable_balances": 3,
        "balances": {
          "authorized": "997268.0000000",
          "authorized_to_maintain_liabilities": "498634.0000000",
          "unauthorized": "249317.0000000"
        },
        "claimable_balances_amount": "124658.5000000",
        ...

• There is a new endpoint at /claimable_balances/{id}/operations{?cursor,limit,order}, to fetch operations for a given claimable balance.
• There is a new endpoint at /claimable_balances/{id}/transactions{?cursor,limit,order}, to fetch transactions for a given claimable balance.

Each SDK must update to support the first item in the list, so that the amount, and num_accounts fields can be deprecated in Horizon v3.
Each SDK should update to support querying operations and transactions for a given Claimable Balance ID.

The SDF's JavaScript SDK released v8.2.0 recently including these changes.

If your SDK has implemented and released these changes, reference the release in a closing comment.

[tamirms]

Seems like this was implemented in #339