Query string utilities

[niteshpurohit]

Type: Task
Parent Issue: #425

Summary

Parse, build, merge, and manipulate URL query strings with array and nested hash support

Scope

Parse, build, merge, and manipulate URL query strings with array and nested hash support

Not In Scope

• Fragment handling
• Custom serialization formats

Acceptance Criteria

• QueryString parses query strings
• Builds query strings from hashes
• Merge support
• Array and nested hash support
• Tests verify all operations
• Documentation with examples

C++ Native Library: No