feat: add Hindi (hi) localization support

[gjaynir0508]

Add Localization Support for Hindi (hi) (Indian Language)

This PR adds Hindi (hi) locale support for Pendulum's date and time formatting.

Includes:

• Full translations for relative time phrases (ago, in, before, after)
• Abbreviated and full month/day names
• Date/time format definitions (L, LL, etc.)
• Patterns similar to existing locales

Note:
Hindi typically does not use ordinal indicators (like "1st", "2nd") in standard date or time expressions.
As such, this PR omits ordinal mappings (Do, Qo, etc.) for now.

If needed in future use cases (like grammatical sentence generation or quarter formatting), a limited ordinal map can be added later.

Tested against typical diff_for_humans() and formatting scenarios.

Let me know if any adjustments are needed!

Pull Request Check List

• Added tests for changed code.
• Updated documentation for changed code. (Not Applicable)

[gjaynir0508]

Note: I noticed that the clock utility currently doesn't specify encoding when opening files.
For certain environments (especially on Windows) this can cause issues when reading locale files that contain Unicode (e.g., Hindi).

While it's not included in this PR to keep the scope limited to locale data, I suggest updating the open() calls in the clock utility to:

open(path, "w", encoding="utf-8")

[codspeed-hq]

CodSpeed Performance Report

Merging #902 will not alter performance

_{Comparing gjaynir0508:hindi-localization (22c2662) with master (fc386be)}

Summary

✅ 1 untouched benchmarks