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/protocol/InnerObjectFormats.cpp

@@ -2,7 +2,7 @@
 #include <xrpl/protocol/SField.h>
 #include <xrpl/protocol/SOTemplate.h>
 
-namespace ripple {
+namespace xrpl {
 
 InnerObjectFormats::InnerObjectFormats()
 {
@@ -180,4 +180,4 @@ InnerObjectFormats::findSOTemplateBySField(SField const& sField) const
     return nullptr;
 }
 
-}  // namespace ripple
+}  // namespace xrpl