[w3c/IndexedDB] Specify keyPath sequence caching behavior on IDBObjectStore (#283)

`objectStore.keyPath === objectStore.keyPath` returns `true` on Firefox and `false` on Chrome when `keyPath` is a sequence. We should probably make this consistent on multiple implementations and add a proper WPT test.

Demo: https://saschanaz.github.io/to-do-notifications/ (Open the console and and try adding an item.)

Probably related to https://github.com/w3c/IndexedDB/issues/235 because using FrozenArray will require the Firefox caching behavior.

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