feat: Contracts with no providers no longer fail

[LMLiam]

📌 Summary

As seen in LMLiam/microsmith#10, it is unexpected that a defined contract should cause compilation failure if there are no providers. However, it is still an expected case of failure if a provider does not annotate with @Serviceprovider.

🔍 Related Issues / Tickets

No related issue.

🛠 Changes in Detail

• Reworked the processor to ensure that
  • Compilation still fails if providers are specified without the annotation
  • Compilation does not fail if a contract is defined with no providers

🧩 Modules Affected

• spi-tooling-annotations
• spi-tooling-processor
• Other:

📦 Versioning

• Version bump applied (release PR)
• Snapshot only (PR build)

🧪 Testing

• Steps:
  1. Updated automatic tests, specifically the error cases to take in a result which allows us to control whether the expected compilation fails or succeeds.

✅ Checklist

• Code builds locally without errors
• All tests pass locally (./gradlew kotest)
• Added/updated tests for new or changed logic
• Updated documentation / README if needed
• No unrelated changes included

📜 Notes for Reviewers

[github-actions]

🆕 PR Snapshot Published to Maven Central Snapshot Repository

You can test this PR build by adding the following dependencies:

Version: 0.1.21-PR11-1761835243-SNAPSHOT

implementation "io.github.eventhorizonlab:spi-tooling-annotations:0.1.21-PR11-1761835243-SNAPSHOT"
kapt "io.github.eventhorizonlab:spi-tooling-processor:0.1.21-PR11-1761835243-SNAPSHOT"

This comment will be updated automatically if a new snapshot is published for this PR