PascalCase for Objects naming

[stroncoso-quobis]

Problem description
Commonalities dictate to use PascalCase for Objects naming

Expected behavior
Multiple schema names are not following the PascalCase convention (in webrtc-registration.yaml):

regSessionRequest → should be RegSessionRequest
regSessionResponse → should be RegSessionResponse
regSessionUpdate → should be RegSessionUpdate
Maybe as well the following ones, but that's questionable:

WrtcSDPDescriptor → should be WrtcSdpDescriptor (in both webrtc-call-handling and webrtc-events)
HTTPSubscriptionRequest → should be HttpSubscriptionRequest
HTTPSubscriptionResponse → should be HttpSubscriptionResponse
HTTPSettings → should be HttpSettings

Alternative solution
n/a

Additional context
Release review #105