feat: implement File System API support (#41827)

* feat: implement File System API support

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* test: add a test for writable permission checking

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: gn check include issues

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* chore: feedback from review

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* chore: cleanup feedback from review

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* refactor: namespace to electron

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fixup! chore: cleanup feedback from review

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* chore: address more feedback from review

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* 5301485: Add content analysis to File System Access Javascript API.

https://chromium-review.googlesource.com/c/chromium/src/+/5301485

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* docs: improve typing of details object

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* chore: address outstanding todo

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* refactor: use Chrome's file system access blocklist

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* lint

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: Windows build

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* test: clarify test verbiage

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

docs/api/structures/permission-request.md

@@ -0,0 +1,4 @@
+# PermissionRequest Object
+
+* `requestingUrl` string - The last URL the requesting frame loaded.
+* `isMainFrame` boolean - Whether the frame making the request is the main frame.