Send an invite url link message when add contact to room which room member count less than 40

[su-chang]

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Send an invite url link message when add contact to room which room member count less than 40.

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Add a parameter invite for method room.add() to trigger send invite url message or not when the room member count less than 40.

/*
  invite, default: false
    - true: send invite url message
    - false: add to room directly
*/
function add(contact: Contact, invite: boolean = false) 

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[enhancement]