Everywhere: Convert ByteBuffer factory methods from Optional -> ErrorOr

Apologies for the enormous commit, but I don't see a way to split this
up nicely. In the vast majority of cases it's a simple change. A few
extra places can use TRY instead of manual error checking though. :^)

Userland/Services/InspectorServer/InspectableProcess.cpp

@@ -53,7 +53,7 @@ String InspectableProcess::wait_for_response()
         return {};
     }
 
-    auto data_buffer = ByteBuffer::create_uninitialized(length).release_value();
+    auto data_buffer = ByteBuffer::create_uninitialized(length).release_value_but_fixme_should_propagate_errors();
     auto remaining_data_buffer = data_buffer.bytes();
 
     while (!remaining_data_buffer.is_empty()) {