Bug-1669566-Add-cookieStoreId-to-browser.downloads (#12069)
Bug-1669566-Add-cookieStoreId-to-browser.downloads (#12069)

* Bug-1669566-Add-cookieStoreId-to-browser.downloads

Adds details of support for cookieStoreId to browser.download.download, downloads.DownloadQuery, and downloads.DownloadItem. In addition, adds the missing properties for downloads.DownloadQuery. This provides compatibility data for [Bug 1669566](https://bugzilla.mozilla.org/show_bug.cgi?id=1669566).

Corresponding changes to MDN documentation are in [Bug 1669566 add cookie store id to browser.downloads #8106](https://github.com/mdn/content/pull/8106)

* Addressed review comments

* Notes added to partially supported items
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data