feat(chain): add live utxo lookup by output ref

[AndrewWestberg]

No description provided.

[Copilot]

Pull request overview

This PR adds a new gRPC endpoint QueryLiveUtxosByOutputRef that queries UTXOs by their output reference (transaction hash and index), checking an in-memory live state cache first before falling back to the database. This is analogous to the existing QueryLiveUtxos endpoint but operates on specific output references rather than addresses.

Changes:

• Added QueryLiveUtxosByOutputRef RPC method to the protobuf service definition
• Implemented the gRPC service handler with consistent error handling
• Added repository layer method that checks live UTXO map before querying the database
• Updated transaction builder to use the new live lookup method for reference scripts
• Bumped version from 0.13.1-SNAPSHOT to 0.13.2-SNAPSHOT

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
newm-chain-grpc/src/main/proto/newm_chain.proto	Added new RPC endpoint definition for querying live UTXOs by output reference
newm-chain/src/main/kotlin/io/newm/chain/grpc/NewmChainService.kt	Implemented gRPC handler for the new endpoint and updated transaction builder to use live lookups
newm-chain-db/src/main/kotlin/io/newm/chain/database/repository/LedgerRepository.kt	Added interface method for querying live UTXOs by output reference
newm-chain-db/src/main/kotlin/io/newm/chain/database/repository/LedgerRepositoryImpl.kt	Implemented method with live cache check and database fallback, plus private helper method
build.gradle.kts	Version bump to reflect new feature addition