feat: add RegistryFactory class

[mshojaei-txfusion]

Description

Implements a new RegistryFactory class to standardize registry creation and adds proxy URL support for the canonical registry. Changes include:

• Added PROXY_DEPLOYED_URL constant
• Implemented RegistryFactory class with support for creating both GitHub and FileSystem registries
• Added proxy URL support for the canonical registry repository
• Added comprehensive unit tests for the new factory implementation
• Exported new registry-related utilities

Backward compatibility

Yes - These changes are backward compatible as they add new functionality without modifying existing behavior.

Related issues

hyperlane-xyz/hyperlane-monorepo#5403

Testing

• Unit tests have been added covering:
  • Registry creation for both HTTPS and local filesystem paths
  • Proxy URL functionality for canonical repository
  • MergedRegistry creation with multiple URIs
  • Error handling for invalid inputs
• All existing registry functionality remains tested and unchanged

[changeset-bot]

🦋 Changeset detected

Latest commit: 7123e5e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@hyperlane-xyz/registry	Minor

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[mshojaei-txfusion]

Closed this as for now we would go with #592
No need for Factory class yet.