Release v0.6.0-rc.4

• First bytes of end to end identity exposed. Thanks to the ACME protocol, it allows requesting a x509 certificate from an authority and then use it to create a MLS Credential.
• Fixed cargo-make Makefile.toml to allow building JVM bindings whatever the platform you're running
  • This is done by adding tests to the relevant tasks, allowing to conditionally execute them.
• Added a Makefile task to build the core_crypto_ffi Kotlin binding docs (via Dokka) and integrate them into the doc package
• Updated UniFFI to 0.22
• Other minor improvements on internal build/release tools (mainly our cargo xtask command)
• Semi-breaking: Behavior change on ProteusCentral::import_cryptobox (aka Cryptobox import).
  • WASM: If the provided store path is missing or doesn't have the expected tables, we now throw a CryptoboxMigrationError::ProvidedPathDoesNotExist error
  • Other platforms: If the provided cryptobox folder at path is missing, we now throw a CryptoboxMigrationError::ProvidedPathDoesNotExist error
  • Likewise, on all platforms, if the Cryptobox Identity is not present, we now throw a CryptoboxMigrationError::IdentityNotFound error and abort the process
• Tooling: Added a custom WASM test runner based on WebDriver (BiDi interactive test progress reporting in progress still)