Brandon Schlinker f20eb76865 Use folly::ObserverContainer for socket observer [3/x] ...

Summary:
This diff is part of larger change to switch to using `folly::ObserverContainer` (introduced in D27062840).

This diff:
- Adds methods to `QuicSocket` to support adding and removing `ObserverContainer` observers. By default, `QuicSocket` implementations will not support observers as `QuicSocket::getSocketObserverContainer` returns `nullptr`, and this will cause `QuicSocket::addObserver` and `QuicSocket::removeObserver` to fail gracefully.
- Adds support in `QuicClientTransport` and `QuicServerTransport` for `ObserverContainer` observers by overriding `getSocketObserverContainer`. Each implementation creates an `ObserverContainer` on construction that is destroyed on destruction.
- Adds the `close` event to the new observer interface and adds corresponding support in `QuicTransportBase`. This allows both the old and new observers to receive the close event. The next diff will do a hard cutover of the rest of the events.

Differential Revision: D35000960

fbshipit-source-id: e75807c97f4385532bf36244591a259aa0a2f4cc

2022-04-18 04:19:31 -07:00

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