SMHAPIService constructor Null safety

1. smh_flutter_sdk
2. smh_api_service
3. SMHAPIService
4. SMHAPIService constructor

SMHAPIService class

1. Constructors
2. SMHAPIService
3. Properties
4. accessTokenInterceptor
5. baseUrl
6. dio
7. hashCode
8. hostType
9. runtimeType
10. Methods
11. configBaseHostWithEnv
12. errorFactory
13. initDio
14. noSuchMethod
15. responseFactory
16. serviceHeader
17. serviceKey
18. serviceQuery
19. setAccessTokenRefreshHandle
20. setupCurrentHostEnv
21. toString
22. urlPaths
23. Operators
24. operator ==