refactor: Rename ripple namespace to xrpl (#5982)

This change renames all occurrences of `namespace ripple` and `ripple::` to `namespace xrpl` and `xrpl::`, respectively, as well as the names of test suites. It also provides a script to allow developers to replicate the changes in their local branch or fork to avoid conflicts.

src/libxrpl/json/json_reader.cpp

@@ -941,7 +941,7 @@ operator>>(std::istream& sin, Value& root)
 
     // XRPL_ASSERT(ok, "Json::operator>>() : parse succeeded");
     if (!ok)
-        ripple::Throw<std::runtime_error>(reader.getFormatedErrorMessages());
+        xrpl::Throw<std::runtime_error>(reader.getFormatedErrorMessages());
 
     return sin;
 }