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Remove `tx_history` and `ledger_header` methods from API version 2. Update `RPC::Handler` to allow for methods (or method implementations) to be API version specific. This partially resolves #4727. We can now store multiple handlers with the same name, as long as they belong to different (non-overlapping) API versions. This necessarily impacts the handler lookup algorithm and its complexity; however, there is no performance loss on x86_64 architecture, and only minimal performance loss on arm64 (around 10ns). This design change gives us extra flexibility evolving the API in the future, including other parts of In API version 2, `tx_history` and `ledger_header` are no longer recognised; if they are called, `rippled` will return error `unknownCmd` Resolve #3638 Resolve #3539