Introduce CSPViolation as pause reason (V8)

This CL adds the CSPViolation pause reason.
Such an enum will be used to enable breakpoints on Trusted Type violations.

Design doc: https://docs.google.com/document/d/1rlRtq_Ai0leS9sqlRvoOL5RNc1BR6Q1yAVvLLJFasMA/
Frontend CL: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2520827
Follow-up CL: https://chromium-review.googlesource.com/c/chromium/src/+/2517519

Bug: chromium:1142804
Change-Id: Iefdbb52115d0ba1810527773a8a2828e795fe533
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2519513
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Alfonso Castaño <alcastano@google.com>
Cr-Commit-Position: refs/heads/master@{#71172}

include/js_protocol.pdl

@@ -508,6 +508,7 @@ domain Debugger
       enum reason
         ambiguous
         assert
+        CSPViolation
         debugCommand
         DOM
         EventListener

test/debugger/test-api.js

@@ -715,6 +715,7 @@ class DebugWrapper {
       case "EventListener":
       case "assert":
       case "debugCommand":
+      case "CSPViolation":
         assertUnreachable();
       default:
         assertUnreachable();