Converting a Value to a Key for IndexedDB is missing some cases

[rasviitanen]

Converting a Value to a Key does not behave as we expect and the implementation is incomplete. For example, we are not able to convert Arrays and Dates. This will also require some changes to the IndexedDBKeyType located in compontents/net_traits/indexeddb_thread.rs, as we need to add support for Arrays and Dates as keys.

Task

• Complete the implementation

Function
convert_value_to_key

Files
components/script/dom/idbobjectstore.rs
compontents/net_traits/indexeddb_thread.rs

Specification
https://www.w3.org/TR/IndexedDB-2/#convert-value-to-key