Add user TSP webhook events

[ivan-pavlik]

This PR adds user TSP webhook events (and thus completes Meetings webhooks block):

• user.tsp_created
• user.tsp_deleted
• user.tsp_updated

Models:

• UserTspAccount, DialInNumber, TspAccount (this can also be used in related API endpoints)
• PhoneNumberType: new value added to enum
• UserTspEvent: base class for user TSP webhook events
• UserTspUpdatedEvent: additionally provides access to data from old_object property

WebhookEventConverter:

• extracted switch by 'eventType' to a separate method that returns webhook event (this allows to avoid assigning 'webHookEvent' variable in each case, now we just return parsed event and assign method result to 'webHookEvent')
• ParseChatMessageFileSentEvent, ParseChatMessageSentEvent, ParseWebinarRegistrationEvent, ParseRecordingProgressTimestamps: return updated event so that we could simply return method result from ParsePayloadToWebhookEvent

Unit tests:

• updated user TSP webhooks data with all possible properties
• adjusted some properties values to be able to reuse existing constants
• introduced UserEmail constant and used it in existing tests
• added missing unit test for 'endpoint.url_validation'

[Jericho]

Looks good to me!

[Jericho]

🎉 This issue has been resolved in version 0.99.0 🎉

The release is available on:

• GitHub Release
• NuGet Package

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