feat: allow repl pause on exception state to be set from env

Right now, it's not possible to configure the debugger to pause on uncaught exceptions
without manually configuring the pause state on each run. This change would allow the
pause state to be configured via a shell env variable to allow for faster CLI-based node
debugging.

lib/internal/debugger/inspect_repl.js

@@ -370,7 +370,7 @@ function createRepl(inspector) {
   const watchedExpressions = [];
   const knownBreakpoints = [];
   let heapSnapshotPromise = null;
-  let pauseOnExceptionState = 'none';
+  let pauseOnExceptionState = process.env.NODE_INSPECT_PAUSE_ON_EXCEPTION_STATE || 'none';
   let lastCommand;
 
   // Things we need to reset when the app restarts