Upgrade to zig 0.15.2

[DISTREAT]

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[Copilot]

Pull request overview

This pull request upgrades the Zig toolchain from version 0.14.x to 0.15.2 and updates the codebase to comply with API changes introduced in the new version. The library version is bumped from 1.1.0 to 1.2.0.

Changes:

• Updated ArrayList API calls to match Zig 0.15.2's new allocator-explicit pattern
• Changed module naming from "zig-csv" to "zig_csv" and reorganized build configuration
• Updated documentation with installation instructions and corrected import paths

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/root.zig	Updated ArrayList initialization and method calls to pass allocator explicitly per Zig 0.15.2 API changes
src/tests.zig	Changed import from "zig-csv.zig" to "root.zig" to match new file structure
build.zig	Refactored build system to use new module-based API with updated library configuration
build.zig.zon	Bumped library version to 1.2.0 and set minimum Zig version to 0.15.2
README.md	Added installation section and updated import paths and example code with parentheses corrections
.github/workflows/ci.yaml	Updated CI workflow to use Zig 0.15.2

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