feat: registering to aztec registry on deployment - #102

describe-changes@v1: with concatenate mode: append

✨ PR Description

Purpose: Add Aztec artifact registry integration to automatically upload compiled contract artifacts to devnet.aztec-registry.xyz during deployment for improved contract discoverability.

Main changes:

• Created artifactRegistry.ts module with upload functions supporting optional, best-effort artifact uploads via environment flags
• Integrated artifact upload into deployCounter function to automatically register Counter contract on deployment
• Added environment configuration for registry URL, upload enablement, and strict mode error handling

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