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Element-R: pass pickleKey in as raw key for indexeddb encryption
Currently, we pass the `pickleKey` to the rust library for use as a passphrase for encrypting its crypto store. The Rust libary then passes that passphrase through 200000 rounds of PBKDF2 to generate an encryption key, which is (deliberately) slow. However, the pickleKey is actually 32 bytes of random data (base64-encoded). By passing the raw key into the rust library, we can therefore save the PBKDF operation. Backwards-compatibility with existing sessions is maintained, because if the rust library discovers that the store was previously encrypted with a key based on a PBKDF, it will re-base64 and PBKDF the key we provide, thus reconstructing the right key.
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