feat: pre-emptive stream creation for protocols

[danisharora099]

We currently create streams with remote peers for a protocol lazily. ie, for eg, when lightpush.send() is called, a stream is created then - thus adding to the time delays for the send() function.

This was also flagged as a problem in #1465.

This PR thus introduces the concept of optimistic streams for protocols. The idea is to open streams with peers upon connection for protocols optimistically in advance. These existing streams can then be used for requests, instead of creating new ones adhoc.

Results:

Messages sent at an interval of 200ms rapidly over lightpush to the node /dns4/node-01.ac-cn-hongkong-c.wakuv2.test.statusim.net/tcp/8000/wss/p2p/16Uiu2HAkvWiyFsgRhuJEb9JfjYxEkoHLgnUQmr1N5mKWnYjxYRVm:

Now:

lightpush: 293.958ms
lightpush: 166.278ms
lightpush: 266.626ms
lightpush: 264.433ms
lightpush: 265.46ms
lightpush: 253.402ms

Before:

lightpush: 397.283ms
lightpush: 475.635ms
lightpush: 485.878ms
lightpush: 538.217ms
lightpush: 487.232ms
lightpush: 486.972ms

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
Waku core	28.67 KB (0%)	574 ms (0%)	2.2 s (+5.48% 🔺)	2.8 s
Waku Simple Light Node	298.75 KB (+0.1% 🔺)	6 s (+0.1% 🔺)	4.8 s (-6.81% 🔽)	10.8 s
ECIES encryption	28.68 KB (0%)	574 ms (0%)	2.1 s (+15.88% 🔺)	2.6 s
Symmetric encryption	28.69 KB (0%)	574 ms (0%)	1.8 s (+110% 🔺)	2.4 s
DNS discovery	118.6 KB (0%)	2.4 s (0%)	3.1 s (+29.39% 🔺)	5.5 s
Privacy preserving protocols	122.62 KB (0%)	2.5 s (0%)	2.8 s (+0.44% 🔺)	5.2 s
Light protocols	28.68 KB (+0.98% 🔺)	574 ms (+0.98% 🔺)	1.9 s (+28% 🔺)	2.5 s
History retrieval protocols	27.91 KB (+0.98% 🔺)	559 ms (+0.98% 🔺)	1.6 s (-10.03% 🔽)	2.1 s
Deterministic Message Hashing	5.64 KB (0%)	113 ms (0%)	497 ms (+10.99% 🔺)	610 ms

[fryorcraken]

"optimistic" is already coined to describe when libp2p client start sending data over a new stream without waiting for the remote peer to confirm stream creation.
Also, this is not "optimistic" but "pre-emptive" so I'd suggest to change the PR title.

[fryorcraken]

Pre-emptively

[danisharora099]

#1536