feat: add util.inspect with full options support

Implements util.inspect() function with the following features:
- depth: control recursion depth for nested objects (supports null for infinite)
- colors: ANSI color output support
- showHidden: show non-enumerable properties
- customInspect: call Symbol.for('nodejs.util.inspect.custom') methods
- maxArrayLength: limit array/set/map elements displayed
- maxStringLength: truncate long strings
- sorted: sort object keys (boolean or custom comparator function)
- breakLength: line length at which to break to multiple lines
- compact: control inline vs multiline formatting (number or false)

Also exports:
- util.inspect.custom symbol (nodejs.util.inspect.custom)
- util.inspect.defaultOptions object

Fixes #1257

Author: chessbyte