fix: mapping and function parameter highlighting

[davidperk]

Fixes #496

1. Fixes declaration-storage-mapping (L1115)

"end": "\\)"  // Changed from "(?=\\))" to actually consume the closing parenthesis

This allows nested mappings like mapping(address => mapping(uint256 => bool)) to work correctly.

2. Adds type-function pattern (L1137-1156)

New pattern to handle function type parameters like:

function(address, uint256) external callback

3. Updates declaration-function-parameters (L952, L955, L958)

Adds three includes to recognize mapping types in parameters, function types in parameters, and visibility modifiers (external, internal, etc.).

[davidperk]

@juanfranblanco 👀