Add `CryptoApi.getSecretStorageStatus` (#5054)
* Add `CryptoApi.getSecretStorageStatus`
`isSecretStorageReady` is a bit of a blunt instrument: it's hard to see from
logs *why* the secret storage isn't ready.
Add a new method which returns a bit more data.
* Update src/rust-crypto/rust-crypto.ts
Co-authored-by: Andy Balaam <andy.balaam@matrix.org>
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Co-authored-by: Andy Balaam <andy.balaam@matrix.org>
