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.

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

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* refactor: use Chrome's file system access blocklist

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

* lint

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* fix: Windows build

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* test: clarify test verbiage

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---------

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

docs/api/structures/open-external-permission-request.md

@@ -0,0 +1,3 @@
+# OpenExternalPermissionRequest Object extends `PermissionRequest`
+
+* `externalURL` string (optional) - The url of the `openExternal` request.