Renaming models, attributes and other elements based on feedback from public preview

[juancamilor]

Azure review for GA:

• Use same terminology than calling (Participant instead of Member)
• Use UpdateTopic instead of UpdateThread in operation name
• Use ChatMessageReadReceipt instead of ReadReceipt in model name
• Return messageId instead of SendMessageResult. (SendMessage operation)
• Add convenience method to add 1 member
  All details : https://skype.visualstudio.com/DefaultCollection/SPOOL/_workitems/edit/2235800

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[juancamilor]

/azp run net - communication

[azure-pipelines]

Pull request contains merge conflicts.

[juancamilor]

/azp run net - communication

[azure-pipelines]

Pull request contains merge conflicts.

[juancamilor]

Could not resolve conflicts