Improve error recovery in collections

[dereuromark]

Summary

Implements improved error recovery

• Add context-aware error recovery that prevents cascading errors when parsing malformed arrays and inline tables
• Add bracket stack tracking to monitor nesting context
• Implement synchronizeInCollection() that recovers to next comma or closing bracket instead of skipping to newline
• Update parseArray() and parseInlineTable() to use bracket-aware recovery

Before vs After

data = [{a = 1}, {b = }, {c = 3}]
other = "value"

Before: 4 cascading errors

Line 1:22: Expected value
Line 2:0: Expected }
Line 2:0: Expected ]
Line 2:0: Expected newline or end of input after value

After: 1 precise error

Line 1:22: Expected value

This enables better IDE/tooling support by providing more accurate error locations and preserving more of the document structure.