Channelname slot based intents

[AdarshNaidu]

This PR contains intents that require channel name resolution before intent confirmation.

This PR contains the following intents:

1. Archive Room
2. Unarchive Room
3. Leave Room
4. Delete Room
5. Change room topic
6. Change room description
7. Rename room
8. Change Status
9. Denied Intent Handler
10. Create Channel
11. Create Group

Additional features in this PR

1. This PR also introduces a generic reprompt message that responds with:

Anything else I can help you with?

after executing an intent or after any error message.

2. These above intents also give random hints for the user to try after the end of an intent or after any errors.

These intents make use of the following intent generation functions:

1. handleConfirmationChannelResolution: This function generates an intent which handles confirmation for any operation that requires channel name resolution. The intent generated from this function responds with intent confirmation or an error message if any. It resolves channel name from the list of rooms that the user is part of before giving confirmation. This function also takes a function as one of the parameters which gets executed at the end. This makes this intent generator function flexible, as it can be modified according to different intents.

2. handleExecutionChannelResolution: This function is responsible for executing the operation if the user has confirmed the intent. This function also takes a function as parameter making it more flexible.