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]

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• 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 balance/query behavior; main risk is output/field parsing assumptions against the /beta/svm/transactions API.

Overview
Adds dune sim svm transactions <address> to query /beta/svm/transactions/{address} with --limit and --offset, supporting both table output and raw JSON output.

Text output now includes derived fields by formatting block_time (microseconds) to UTC timestamps and extracting the first transaction signature from raw_transaction; includes integration-style tests covering text/JSON output, limit, pagination, and presence of raw_transaction.

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