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/test/consensus/DistributedValidatorsSim_test.cpp

@@ -11,7 +11,7 @@
 #include <string>
 #include <utility>
 
-namespace ripple {
+namespace xrpl {
 namespace test {
 
 /** In progress simulations for diversifying and distributing validators
@@ -254,7 +254,7 @@ class DistributedValidators_test : public beast::unit_test::suite
     }
 };
 
-BEAST_DEFINE_TESTSUITE_MANUAL_PRIO(DistributedValidators, consensus, ripple, 2);
+BEAST_DEFINE_TESTSUITE_MANUAL_PRIO(DistributedValidators, consensus, xrpl, 2);
 
 }  // namespace test
-}  // namespace ripple
+}  // namespace xrpl