Add @tool2agent/middleware-logging package

[konard]

Summary

• Implements a logging middleware for tool2agent that logs tool call inputs, outputs, and timing information
• The logger function is configurable (as requested in the issue)
• Supports both sync and async logger functions
• Provides rich log entries including input, result, options, duration, and timestamps

Features

• Configurable logger: Pass any function that receives LogEntry<InputType, OutputType>
• Async support: Logger can be async for sending logs to external services
• Timing information: Measures execution duration in milliseconds with start/complete timestamps
• Composable: Works with other middleware via pipe()

Test plan

• Unit tests for basic functionality (logging input, result, options)
• Unit tests for timing information (duration, startedAt, completedAt)
• Unit tests for async logger support
• Unit tests for error/failure logging
• Unit tests for multiple tool calls
• Unit tests for complex input/output types
• All 13 tests passing

Fixes #2

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[konard]

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