DEV: Add optional support for running byebug when a PG Clash happens

Tracking down concurrency issues from backtraces and manual repros is a fraught process.
Sometimes you've just got to get your hands dirty and do a live debug.

config/initializers/000-trace_pg_connections.rb

@@ -50,6 +50,11 @@ if ENV["TRACE_PG_CONNECTIONS"]
 
             #{Thread.current&.backtrace&.join("\n")}
           STRING
+
+          if ENV["ON_PG_CLASH"] == "byebug"
+            require "byebug"
+            byebug
+          end
         end
         @accessor_thread = Thread.current
       end