APIv2: remove tx_history and ledger_header (#4759)

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
#4727.

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

src/test/jtx/TestHelpers.h

@@ -27,10 +27,19 @@
 #include <ripple/protocol/jss.h>
 #include <test/jtx/Env.h>
 
+#include <ranges>
+
 namespace ripple {
 namespace test {
 namespace jtx {
 
+// Helper to make vector from iterable
+auto
+make_vector(auto const& input) requires std::ranges::range<decltype(input)>
+{
+    return std::vector(std::ranges::begin(input), std::ranges::end(input));
+}
+
 // Functions used in debugging
 Json::Value
 getAccountOffers(Env& env, AccountID const& acct, bool current = false);