[w3c/permissions] Add an optional `embeddingOrigin` to the `permissions.setPermission` command (PR #468)

Updates the `permissions.setPermission` command and the `permission key generation algorithm`. The command now accepts an optional `embeddingOrigin` parameter to support permissions that require double-keying, such as the [Storage Access API](https://privacycg.github.io/storage-access/#permissions-integration). The `permission key generation algorithm` has been updated to accept origin and top-level origin as direct inputs, instead of an [Environment Settings Objects](https://html.spec.whatwg.org/multipage/webappapis.html#environment-settings-object) (ESO). This allows WebDriver to properly set a permission, since it doesn't necessarily have an ESO to pass.

closes #450

The following tasks have been completed:

 * [ ] Modified Web platform tests (link)

Implementation commitment:

 * [ ] WebKit (link to issue)
 * [ ] Blink (link to issue)
 * [ ] Gecko (link to issue)


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/468

-- Commit Summary --

  * Add embedding origin to set permission command
  * Change the key generation algorithm to use an origin and top level origin instead of an ESO

-- File Changes --

    M index.html (51)

-- Patch Links --

https://github.com/w3c/permissions/pull/468.patch
https://github.com/w3c/permissions/pull/468.diff

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