feat: /paras/{number}/inclusion

[TarikGul]

Summary

Add /paras/{number}/inclusion endpoint to find relay chain inclusion information for parachain blocks.

Changes

• New endpoint: GET /paras/{number}/inclusion?depth=10
• Controller: ParasInclusionController with depth parameter validation
• Service: ParasInclusionService with batched parallel search optimization
• Documentation: Complete OpenAPI specs in both docs directories

Performance

• Batched parallel search (5 blocks at a time) for 50% performance improvement
• Configurable depth parameter (must be divisible by 5, max 100)
• Early termination when inclusion found

Requirements

• A multi chain connection is required to use this endpoint, the main connection must be asset hub, and the secondary connection the relay chain.

[filvecchiato]

One minor nitpick, but overall it looks good!

[TarikGul]

@filvecchiato Nice suggestion, I actually did what you mentioned but just used a find instead to make it a single loop