port: [#6701] Add ConnectorClientOptions to ConfigurationBotFrameworkAuthentication

[sw-joelmut]

Addresses # 6701
#minor

Description

This PR ports from JavaScript the ability to add a custom user agent through the new ConnectorClientOptions, provided in the ConfigurationBotFrameworkAuthentication class.

Specific Changes

• Added ConnectorClientOptions class containing the user agent property.
• Added AddUserAgent method to the ConnectorClientEx static class.
• Connected the new ConnectorClientOptions class from ConfigurationBotFrameworkAuthentication through the code flow, up to ConnectorFactoryImpl and UserTokenClientImpl.
• Added new unit tests around the new ConnectorClientOptions class.

Testing

The following images show the new test passing and how the new ConnectorClientOptions could be used from a bot.

[sw-joelmut]

[sw-joelmut]

Close as it's no longer required