Remove nix dependency from Resource public API

Walkthrough

The recent changes improve the handling of resource limits in the yash project by replacing the rlim_t type with a more descriptive Limit type, enhancing type safety and code clarity. The constant RLIM_INFINITY has also been standardized to INFINITY, promoting consistency across the codebase. These updates streamline resource management and align with best practices in Rust, making the system more robust and maintainable.

Changes

Files	Change Summary
`yash-builtin/src/ulimit.rs`, `yash-builtin/src/ulimit/resource.rs`,	Replaced `rlim_t` with `Limit` type in resource limit handling; updated `scale` method return type to `Limit`.
`yash-builtin/src/ulimit/set.rs`, `yash-builtin/src/ulimit/show.rs`	Replaced constant `RLIM_INFINITY` with `INFINITY`; updated logic and tests accordingly to reflect new constant.
`yash-env/CHANGELOG.md`, `yash-env/src/system.rs`, `yash-env/src/system/real.rs`	Updated documentation and error handling; changed `rlim_t` to `Limit` and `RLIM_INFINITY` to `INFINITY`.
`yash-env/src/system/resource.rs`, `yash-env/src/system/virtual.rs`	Introduced `RawLimit` type alias for platform compatibility; updated use of constants and types in resource limit logic.
`yash-env/src/system/virtual/process.rs`	Updated handling of resource limits by replacing `RLIM_INFINITY` with `INFINITY` in various checks.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant System
    participant ResourceManager

    User->>System: Request resource limit
    System->>ResourceManager: Get current limits
    ResourceManager-->>System: Returns Limit (soft, hard)
    System-->>User: Provides limits (INFINITY, etc.)

🐰 In the land of code, a change took flight,
Types reshaped, bringing clarity bright.
From rlim_t to Limit, so clear and so bold,
With INFINITY shining, new tales to be told!
Hopping through limits, we celebrate the day,
For better resource handling is the bunny way! 🐇✨

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magicant / yash-rs