feat: peer exchange discovery improvements

[weboko]

Problem / Description

We observed some questionable behavior of PX discovery in tests and a lot of them were commented for a while.

For example:
https://github.com/waku-org/js-waku/blob/459fe96fe6beeec61f1403829b49bd07d2d559ef/packages/tests/tests/peer-exchange/query.spec.ts#L144

Additionally while investigating how js-waku behaves during cold/warm start - I observed that behavior can be improved.

Solution

This PR brings following changes:

• increases query window from 10 peers pers query to 60 peers;
• implements recurring quarries to existing connections with time interval of 30s;
• lightens implementation of PX/Discovery by removing dead and unnecessary code;
• adds UT and E2E tests;

Notes

Resolves:

• partially feat: measure cold/warm bootstrap time #2477
• bug: node doesn't discover new peers that are started after the initial peer discovery phase #1860
• feat: improve peer exchange discovery speed #2542
• bug: peer-exchange doesn't get triggered in e2e tests #2446

Relevant to: #2276

---

Checklist

• Code changes are covered by unit tests.
• Code changes are covered by e2e tests, if applicable.
• Dogfooding has been performed, if feasible.
• A test version has been published, if required.
• All CI checks pass successfully.

[Copilot]

Pull Request Overview

This PR implements significant improvements to the peer exchange discovery functionality to address questionable behavior observed in tests and enhance the cold/warm start behavior of js-waku.

• Increases query window from 10 to 60 peers per query and implements 30-second recurring queries
• Replaces the existing peer exchange implementation with a more efficient one that removes dead code
• Adds comprehensive unit tests and re-enables previously commented E2E tests

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/tests/tests/peer-exchange/query.spec.ts	Completely removed flaky test file that was causing CI issues
packages/tests/tests/peer-exchange/peer_exchange.spec.ts	Updated tests to use new API and re-enabled previously skipped tests
packages/tests/tests/peer-exchange/pe.optional.spec.ts	Moved DNS discovery test to appropriate location
packages/tests/tests/peer-exchange/continuous_discovery.spec.ts	Removed obsolete continuous discovery test file
packages/tests/tests/peer-exchange/compliance.spec.ts	Updated to use new peer exchange implementation
packages/tests/tests/dns-discovery/dns_discovery.optional.spec.ts	New DNS discovery test file moved from peer exchange
packages/tests/tests/dns-discovery/dns-peer-discovery.spec.ts	Fixed import path
packages/tests/tests/connection-mananger/discovery_dialer.spec.ts	Re-enabled discovery dialer tests
packages/discovery/src/peer-exchange/waku_peer_exchange_discovery.ts	Removed old peer exchange discovery implementation
packages/discovery/src/peer-exchange/peer_exchange_discovery.ts	New streamlined peer exchange discovery implementation
packages/discovery/src/peer-exchange/peer_exchange_discovery.spec.ts	Comprehensive unit tests for new implementation
packages/discovery/src/peer-exchange/peer_exchange.ts	Refactored peer exchange class with improved error handling
packages/discovery/src/peer-exchange/peer_exchange.spec.ts	Unit tests for the peer exchange class
packages/discovery/src/peer-exchange/index.ts	Updated exports to use new implementation
packages/discovery/src/peer-exchange/constants.ts	New constants file with updated peer request limits
packages/discovery/src/index.ts	Updated exports structure
packages/discovery/src/dns/dns.spec.ts	Removed debug console.log statement

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
Waku node	70.34 KB (-0.08% 🔽)	1.5 s (-0.08% 🔽)	853 ms (+28.09% 🔺)	2.3 s
Waku Simple Light Node	121.66 KB (-0.12% 🔽)	2.5 s (-0.12% 🔽)	785 ms (+48.62% 🔺)	3.3 s
ECIES encryption	20.8 KB (0%)	417 ms (0%)	466 ms (+171.28% 🔺)	882 ms
Symmetric encryption	20.3 KB (0%)	407 ms (0%)	267 ms (+32.45% 🔺)	673 ms
DNS discovery	51.6 KB (-0.03% 🔽)	1.1 s (-0.03% 🔽)	686 ms (+46.2% 🔺)	1.8 s
Peer Exchange discovery	52.34 KB (-0.06% 🔽)	1.1 s (-0.06% 🔽)	564 ms (-15.32% 🔽)	1.7 s
Local Peer Cache Discovery	46.03 KB (-0.21% 🔽)	921 ms (-0.21% 🔽)	615 ms (+80.6% 🔺)	1.6 s
Privacy preserving protocols	53.61 KB (+0.14% 🔺)	1.1 s (+0.14% 🔺)	451 ms (-2.72% 🔽)	1.6 s
Waku Filter	55.35 KB (+0.05% 🔺)	1.2 s (+0.05% 🔺)	732 ms (+12.66% 🔺)	1.9 s
Waku LightPush	52.98 KB (-0.05% 🔽)	1.1 s (-0.05% 🔽)	539 ms (-4.99% 🔽)	1.6 s
History retrieval protocols	59.31 KB (+0.01% 🔺)	1.2 s (+0.01% 🔺)	702 ms (+3.24% 🔺)	1.9 s
Deterministic Message Hashing	28.44 KB (0%)	569 ms (0%)	525 ms (+58.07% 🔺)	1.1 s