Add Heap data structure implementation with tests

[Gabenoob]

This pull request introduces a new, generic heap data structure implementation and integrates it into the build and test system. The main changes are the addition of a reusable Heap type, updates to the build scripts to support building and testing the heap, and documentation updates to reflect the new file.

Data Structures:

• Added a generic Heap implementation in dataStructures/heap.zig, supporting both min-heaps and max-heaps via a comparator function, with insert, extract, peek, and size operations. Includes comprehensive tests for both heap types.

Build System:

• Updated build.zig to support building and running tests for the new heap data structure with the "ds/heap" operation.
• Updated runall.zig to include the heap data structure in the suite of tests run by default.

Documentation:

• Added heap.zig to the list of data structure files in CONTRIBUTING.md.

[Copilot]

Pull request overview

This pull request adds a generic heap data structure implementation to support both min-heaps and max-heaps. The implementation uses an ArrayList-backed binary heap with standard heap operations and integrates with the existing build and test infrastructure.

Changes:

• Added a new generic Heap type in dataStructures/heap.zig with insert, extract, peek, and size operations
• Updated build.zig to add build configuration for the heap data structure
• Updated runall.zig to include heap tests in the default test suite
• Updated CONTRIBUTING.md documentation to list the new heap.zig file

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
dataStructures/heap.zig	New generic heap implementation with min/max heap support via comparator functions, including siftUp/siftDown operations and comprehensive tests
build.zig	Added build configuration for "ds/heap" operation
runall.zig	Added heap to the default test suite
CONTRIBUTING.md	Updated file listing to include heap.zig in alphabetical order

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