refactor: Update to Boost 1.88 (#5570)

This updates Boost to 1.88, which is needed because Clio wants to move to 1.88 as that fixes several ASAN false positives around coroutine usage. In order for Clio to move to newer boost, libXRPL needs to move too. Hence the changes in this PR. A lot has changed between 1.83 and 1.88 so there are lots of changes in the diff, especially in regards to Boost.Asio and coroutines in particular.

src/test/rpc/ValidatorRPC_test.cpp

@@ -187,14 +187,14 @@ public:
         for (auto const& val : validators)
             expectedKeys.insert(toStr(val.masterPublic));
 
-        // Manage single-thread io_service for server.
+        // Manage single-thread io_context for server.
         BasicApp worker{1};
         using namespace std::chrono_literals;
         NetClock::time_point const validUntil{3600s};
         NetClock::time_point const validFrom2{validUntil - 60s};
         NetClock::time_point const validUntil2{validFrom2 + 3600s};
         auto server = make_TrustedPublisherServer(
-            worker.get_io_service(),
+            worker.get_io_context(),
             validators,
             validUntil,
             {{validFrom2, validUntil2}},