feat: separate trie log retention limit and rename prune window to batch size

[crStiv]

Fixes #8990

• Rename "prune window" to "batch size" throughout codebase
• Add separate --bonsai-trie-logs-retention-limit option (default: 14,400 blocks)
• Show batch size in startup log only when explicitly set
• Use --bonsai-historical-block-limit as retention default if not explicitly set (backward compatible)

Changes:

• Renamed getTrieLogPruningWindowSize() to getTrieLogPruningBatchSize()
• Added getTrieLogRetentionLimit() with default 14,400 (2 days at 12s block time)
• Updated CLI option: --bonsai-trie-logs-pruning-window-size → --bonsai-trie-logs-pruning-batch-size
• Added new CLI option: --bonsai-trie-logs-retention-limit
• Updated startup log to conditionally display batch size