feat(rstcheck): Add automatic --config support with version check

[PsickOSSH]

Description

This PR implements automatic support for the --config option in rstcheck when the installed version supports it (>= 3.4.0).

This solves the issue where rstcheck would not load project-level configuration files (e.g., .rstcheck.cfg) because ALE runs linters on temporary files in /tmp. By passing --config <file_dir>, we ensure rstcheck looks for configuration in the correct location.

Implementation Details

• Used ale#semver#RunWithVersionCheck to detect rstcheck version.
• If version is >= 3.4.0, automatically appends --config with the file's directory.
• Re-integrated the custom Handle function from PR Call rstcheck with --config option #2411 to correctly parse rstcheck output format.
• Removed the need for manual configuration options (like g:ale_rst_rstcheck_use_project_config) as requested in previous reviews.

References

• Based on initial work by @goerz in PR Call rstcheck with --config option #2411.
• Closes rstcheck cannot use config files #2408 (rstcheck config ignored).
• Closes Implement ale_rst_rstcheck_options #2144 (rstcheck options support).

Question for Reviewers

Is this implementation aligned with what you expected ?
If the approach looks good to you, I will proceed with adding the Vader tests.

[w0rp]

Just needs some tests adding. I'll ask OpenCode to give it a go.

[w0rp]

GPT 5.3 Codex in OpenCode one-shotted the tests with some instructions I'll add. I do recommend.

Cheers! 🍻