fix: add timeout for incoming connections and build-in protocols (#1292)

Ensure that we don't wait forever for upgrading an inbound connection
to occur.

Note that transports should return an AbortableSource when passed an
AbortSignal so outbound connections to not need the same fix.

Also adds default timeouts for the ping, fetch, and identify protocols.

examples/webrtc-direct/test.js

@@ -60,8 +60,8 @@ export async function test () {
                   selector => {
                       const text = document.querySelector(selector).innerText
                       return text.includes('libp2p id is') &&
-                        text.includes('Found peer') &&
-                        text.includes('Connected to')
+                        text.includes('Found peer 12D3KooWCuo3MdXfMgaqpLC5Houi1TRoFqgK9aoxok4NK5udMu8m') &&
+                        text.includes('Connected to 12D3KooWCuo3MdXfMgaqpLC5Houi1TRoFqgK9aoxok4NK5udMu8m')
                   },
                   '#output',
                   { timeout: 10000 }