Implements dynamic traffic characteristics:
- data burst size
- time to next burst (subject to resolve TODOs pending on RAN2 LS)
- expedited transfer indication

to following data structures and resources:
- ServiceAccessInformation resource
- QosRange data model
- ClientQosSpecification data model

Additional comments:
- Rebased onto specs after CT#108

Signed-off-by: Andrei Stoica <rstoica@lenovo.com>