Fix (Book): Override async method properly and add using on stream deserialization
Feat (Test): Implement book multicasting tests for IMP
Sellers at 2022-05-04:
- Imperatours - [MPRT]
- Bookabed - [BAB]
- TotalStay (JacTravel) - [TSY]
Feat (Test): Implement book multicasting tests for IMP
Sellers at 2022-05-04: