Wrapper: Allow null src_lengths to be passed to shaderSource

[hazeycode]

Fixes #13

[Copilot]

Pull Request Overview

This PR updates the shaderSource wrapper to accept an optional src_lengths array, allowing callers to pass null lengths and rely on null-terminated strings.

• Change signature to maybe_src_lengths: ?[]const u32
• Only assert length matching when lengths are provided
• Pass null to binding when lengths are omitted

Comments suppressed due to low confidence (2)

src/wrapper.zig:2769

• The commented signature above the function is now outdated; update it to mention that src_lengths is optional (?[]const u32) or remove it if no longer needed.

        ) void {

src/wrapper.zig:2765

• Consider adding a unit or integration test for the new code path where maybe_src_lengths is null, to ensure the binding correctly handles null-terminated source strings.

        pub fn shaderSource(