Implement missing classic operations

[fnando]

• allow-trust (deprecated)
• create-claimable-balance
• claim-claimable-balance
• begin-sponsoring-future-reserves
• end-sponsoring-future-reserves
• revoke-sponsorship
• clawback
• clawback-claimable-balance
• liquidity-pool-deposit
• liquidity-pool-withdraw
• invoke-host-function¹ (use stellar contract invoke instead)
• extend-footprint-ttl¹ (use stellar contract extend instead)
• restore-footprint¹ (use stellar contract restore instead)

https://developers.stellar.org/docs/learn/fundamentals/transactions/list-of-operations

Footnotes

1. hard to add right now because it'd require a lot of changes to support TransactionExt::V1(SorobanTransactionData) ↩ ↩² ↩³