Add support for named parameters in method calls (param=value syntax)

[MrCoder]

Feature Request

Description

Currently, the DSL does not support named parameters in method calls. We would like to add support for syntax like:

A.method(param=value)
A.method(param1=value1, param2=value2)

Current Behavior

The parser only supports positional parameters:

A.method(value1, value2)

Desired Behavior

Support both positional and named parameters:

// Named parameters
A.method(userId=123, name="John")

// Mixed (positional first, then named)
A.method(123, name="John")

// Still support existing positional syntax
A.method(123, "John")

Use Cases

• Improved readability when method calls have many parameters
• Self-documenting code where parameter names clarify intent
• Better alignment with modern programming language conventions
• Enhanced UML sequence diagram expressiveness

Implementation Notes

This would require updates to:

• ANTLR grammar files in src/g4/
• Parser logic in src/parser/
• Message rendering components to display named parameters

Acceptance Criteria

• Grammar supports param=value syntax in method calls
• Parser correctly extracts named parameters
• Rendered diagrams display named parameters appropriately
• Tests cover both named and positional parameter scenarios
• Backward compatibility with existing positional syntax