Add start delay for typing indicator

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Is your feature request related to a problem? Please describe.

When a message is written and sent very quickly, another user hides the typing indicator later than the message is received. Moreover, sometimes the indicator appears later than the typed message was received.

The result is:

1. You have a message from Alice!
2. Hey, Alice is typing to you (already received message message)
3. Alice's stopped typing

Describe the solution you'd like

Add a delay before starting the typing indicator. For example, for 5 or 10 seconds.

With slow messaging:

1. User is typing
2. Wait for 5 sec
3. Send startTyping and launch the interval
4. User has sent the message
5. Send stopTyping

With fast messaging:

1. User is typing
2. Wait for 5 sec
3. User has sent the message
4. Nothing happened

Describe alternatives you've considered

An alternative solution is to make the same on the receiver side.

Start by tracing the JavaScript typing-indicator flow around the startTyping and stopTyping events described in the issue. Verify how the current interval is launched and cancelled, then confirm that fast messages send neither event while slower typing starts the indicator only after the delay and stops it after sending.