chore: refactor ZigModuleInfo

[aherrmann]

Zig's module system is changing drastically between releases. However, the direction seems to be a system where each module is represented on the command-line by a either multiple arguments in a specific order (0.12.0) or a single flag with a complex structure (0.11.0). Neither of those lends itself to tracking parts of the command-line separately in depset values to later on pass to args.add_all.

Instead, we track modules in a depset of struct that carries all relevant information for each module, and later apply args.add_all using the map_each parameter to render the flags for each module.

• zig_module_info constructor function
• Use zig_module_info
• Remove unused ZigModuleInfo fields
• pkg --> mod in module info test
• Store structured module arguments
• Factor out dependency name rendering
• Change ZigModuleInfo field names