Add svm transactions command with signature extraction and block time formatting

[ivpusic]

Add dune sim svm transactions <address> for SVM transaction history. Extracts first tx signature from raw data, formats block_time (microseconds) as readable timestamps. Supports text/JSON output with pagination.

[ivpusic]

• Add svm transactions command with signature extraction and block time formatting #39 👈 (View in Graphite)
• Add svm balances command with SimClient wiring #38
• 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: adds a new CLI subcommand and tests without changing existing business logic, aside from updating sim svm help text and command registration.

Overview
Adds dune sim svm transactions <address> to fetch wallet transaction history from /beta/svm/transactions/<address>, with --limit/--offset pagination and text/JSON output.

Text output now renders a table including chain, slot, formatted UTC block time (microseconds), and the first extracted transaction signature; JSON output returns the raw API payload. Includes integration-style tests covering text/JSON output, limit handling, pagination, and presence of raw_transaction data.

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[ivpusic]

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