Stellar: Removing Ledger State from SQL Databases in 22.1

Starting with the stellar-core 22.1 release, SQL will be unsupported for most ledger state and transaction history, with deprecated tables being dropped unconditionally. The –in memory mode flag is also unsupported from version 22.1, with full removal in version 23.0. A new high throughput HTTP query server with the getledgerentryraw endpoint is introduced to support ledger state queries.