Remove legacy crypto files (#4672)

* fix(legacy store): fix legacy store typing

In #4663, the storeXXX methods were removed of the CryptoStore interface but they are used internally by IndexedDBCryptoStore.

* feat(legacy crypto)!: remove content of `crypto/*` except legacy stores

* test(legacy crypto): remove `spec/unit/crypto/*` except legacy store tests

* refactor: remove unused types

* doc: fix broken link

* doc: remove link tag when typedoc is unable to find the CryptoApi

Author: florianduros