refactor: split string converters

Merge pull request #16 from Rutherther/packets-list-inline-serializer

Add generation of packet list inline serializer

feat: use StringBuilder Append overloads

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

fix: return correct errors with inner results

feat: add bool type converter

feat: add char and string type converters

feat: allow nullables in converters

feat: add base packet types converting