GHSA-m325-rxjv-pwph: Deserialization functions pass uninitialized memory to user-provided Read

Affected versions of this crate passed an uninitialized buffer to a user-provided Read instance in:

• deserialize_binary
• deserialize_string
• deserialize_extension_others
• deserialize_string_primitive

This can result in safe Read implementations reading from the uninitialized buffer leading to undefined behavior.