feat: Integrated Orval

[m-t-a97]

• Integrated Orval into the library which auto-generates TypeScript code from the Authula openapi spec.
• Library then provides all types and methods via the orval generated code thereby improving the reliability of the library and making sure that it stays consistent with the Authula backend.
• Maintains the same SDK structure as previously but may introduce breaking changes which will be documented.

Closes #3