Add svm balances command with SimClient wiring

[ivpusic]

Add dune sim svm balances <address> for querying SVM token balances across Solana/Eclipse chains with USD valuations. Supports --chains, --limit, --offset flags, text table and JSON output.

[ivpusic]

• Add svm transactions command with signature extraction and block time formatting #39
• Add svm balances command with SimClient wiring #38 👈 (View in Graphite)
• Add evm defi-positions command for DeFi portfolio positions #37
• Add evm token-holders command with token address as positional arg #36
• Add evm token-info command for token metadata and pricing #35
• Add evm collectibles command for NFT listings with spam filtering #34
• Add evm transactions command and fix OpenAPI spec gaps across all EVM commands #33
• EVM activity #31
• Sim evm stablecoins #30
• Get balance #29
• Sim evm balances #28
• Supported chains #27
• Sim auth #26
• main

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PR Summary

Low Risk
Low risk and mostly additive: introduces a new CLI subcommand plus e2e-style tests, with no changes to existing auth or data mutation paths beyond reusing the existing Sim client context wiring.

Overview
Adds dune sim svm balances <address> to query the Sim API GET /beta/svm/balances/{address} with optional --chains, --limit, and --offset parameters, supporting both table (text) output and passthrough -o json output.

Wires SVM subcommands to a small SimClient interface extracted from command context (requireSimClient) and adds authenticated e2e tests covering text/JSON output, chain filtering, limit, and pagination behavior (skipped if DUNE_SIM_API_KEY is unset).

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