feat: get metadata uri; pin AVM version 12

[cusma]

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[Copilot]

Pull request overview

This PR adds a new ABI method arc89_get_metadata_partial_uri to retrieve the Asset Metadata ARC-90 partial URI without the compliance fragment. The implementation calls the existing arc90_box_query function with an empty box name to construct the URI.

Key Changes

• Added new readonly ABI method to retrieve the ARC-90 partial URI
• Refactored Bytes(b"") to Bytes() for cleaner empty bytes initialization
• Updated TEAL compilation artifacts to include the new method routing

Reviewed changes

Copilot reviewed 4 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
smart_contracts/asa_metadata_registry/interface.py	Added abstract method declaration for arc89_get_metadata_partial_uri
smart_contracts/asa_metadata_registry/contract.py	Implemented the method by calling arc90_box_query with empty box name
smart_contracts/avm_common.py	Simplified empty Bytes initialization from Bytes(b"") to Bytes()
tests/test_arc89_get_metadata_partial_uri.py	Added test with workaround for broken .abi_return value
smart_contracts/artifacts/asa_metadata_registry/AsaMetadataRegistry.approval.teal	Updated TEAL bytecode with new method routing and arc90_box_query subroutine
poetry.lock	Reordered dependency markers and removed Python 3.8 wheel entries

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