Feat/cs/fix null objs

[ReagentX]

• Support Null objects for Any way to read this? #5
• Add depth limits to object primitive DFS
• Reduce allocation overhead

[Copilot]

Pull Request Overview

This PR adds support for Null objects and improves performance through allocation optimization and depth limits. The changes address issue #5 by introducing null value handling and prevent potential infinite loops in object traversal.

• Adds Null variant to OutputData enum for representing null values
• Implements depth limits and item count limits in DFS traversal to prevent infinite loops
• Optimizes memory allocation by using estimated capacities based on data size

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/models/output_data.rs	Adds Null variant to OutputData enum with display formatting
src/deserializer/typedstream.rs	Handles null objects and optimizes allocation with estimated capacities
src/deserializer/iter.rs	Adds depth/item limits to primitive collection and print functions
src/error.rs	Changes pointer formatting from decimal to hexadecimal
src/lib.rs	Adds test case for parsing large files with null objects

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