Sponsorship and claimable balance operations and effects

[leighmcculloch]

Issue Description

I've noticed when viewing accounts that have claimable balance operations, and sponsorship operations, that the generic 'unrecognized' operation text that was introduced in #198 gets displayed. I think this means the explorer doesn't currently have a definition for how to display these operations and so no meaningful information is being displayed.

The operations missing definitions appear to be:

• create_claimable_balance
• claim_claimable_balance
• begin_sponsoring_future_reserves
• end_sponsoring_future_reserves
• revoke_sponsorship

The list of operations are here:
https://github.com/stellar/go/blob/5c62e03/protocols/horizon/operations/main.go#L31-L35

Example:

Ref: https://steexp.com/account/GDTNXS4SNQFDXBVKOBU6QIAMAW6A3KV3VK4Z5RSDLAB7YXZSUIL2PU4X#operations

Similar with effects, there looks to be 18 effects missing definitions:

• claimable_balance_created
• claimable_balance_claimed
• claimable_balance_claimant_created
• account_sponsorship_created
• account_sponsorship_updated
• account_sponsorship_removed
• trustline_sponsorship_created
• trustline_sponsorship_updated
• trustline_sponsorship_removed
• data_sponsorship_created
• data_sponsorship_updated
• data_sponsorship_removed
• claimable_balance_sponsorship_created
• claimable_balance_sponsorship_updated
• claimable_balance_sponsorship_removed
• signer_sponsorship_created
• signer_sponsorship_updated
• signer_sponsorship_removed

The list of effects are here:
https://github.com/stellar/go/blob/5c62e03/protocols/horizon/effects/main.go#L207-L224

Example:

Ref: https://steexp.com/account/GDTNXS4SNQFDXBVKOBU6QIAMAW6A3KV3VK4Z5RSDLAB7YXZSUIL2PU4X#effects

[chatch]

Thank you @leighmcculloch . I'll look at adding support for these soon.

[Ahmadjakaria]

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