Extract pairing logic into lib-pairing module

[pditommaso]

Summary

• Create lib-pairing Gradle submodule for credential federation functionality
• Move pairing service, WebSocket transport, and message types to new module
• Extract configuration into PairingConfig interface with implementation in Wave
• Create LicenseValidator interface for decoupling license validation
• Rename package from io.seqera.wave.service.pairing to io.seqera.service.pairing
• Update all Wave imports to reference the new library package

Changes

New lib-pairing module structure

lib-pairing/
├── src/main/groovy/io/seqera/service/pairing/
│   ├── PairingConfig.groovy (interface)
│   ├── PairingService.groovy (interface)
│   ├── PairingServiceImpl.groovy
│   ├── PairingRecord.groovy
│   ├── PairingStore.groovy
│   ├── LicenseValidator.groovy (interface)
│   ├── exchange/
│   │   ├── PairingRequest.groovy
│   │   └── PairingResponse.groovy
│   └── socket/
│       ├── PairingWebSocket.groovy
│       ├── PairingChannel.groovy
│       ├── PairingOutboundQueue.groovy
│       ├── PairingInboundStore.groovy
│       ├── PairingMessageEncodeStrategy.groovy
│       └── msg/
│           ├── PairingMessage.groovy
│           ├── PairingResponse.groovy
│           ├── PairingHeartbeat.groovy
│           ├── ProxyHttpRequest.groovy
│           └── ProxyHttpResponse.groovy
├── build.gradle
├── VERSION
└── README.md

Wave integration

• PairingConfigImpl implements PairingConfig with @Value annotations
• LicenseManValidator implements LicenseValidator to bridge to LicenseManClient
• All imports updated to use io.seqera.service.pairing package

Test plan

• All 15 pairing tests pass
• Manual verification of pairing WebSocket endpoint
• Integration test with Tower credential federation

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