feat: use ReadOnlySpan for deserialization instead of strings

refactor: split string converters

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

fix: return correct errors with inner results

feat: add possibility to add reason to PacketParameterSerializerError

chore: rename parameter serializer error

feat: add errors for converting packets

feat: allow nullables in converters

feat: add base packet types converting