The onTeamsMemberAdded event calls getMembers() to create a fully hydrated TeamsChannelAccount object. Now that Teams has released the get single member endpoint, we should update the SDK to use that instead.

As an example, here's the method in the C# repo that needs to be changed: https://github.com/microsoft/botbuilder-dotnet/blob/92242ea0826ea94e671d1b1a98c62fcd5042059a/libraries/Microsoft.Bot.Builder/Teams/TeamsActivityHandler.cs#L251

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