Add Saudi Arabia Locale with Support for New Saudi Riyal Symbol

[obahareth]

The new Saudi Riyal symbol scheduled to be released with Unicode 17.0

Raw symbol: ⃁
Unicode codepoint: U+20C1

References:

• https://blog.unicode.org/2025/03/support-for-new-saudi-riyal-currency.html
• https://unicode-explorer.com/c/20C1

NOTE:
It probably isn't a good idea to merge or release this without widespread adoption of Unicode 17, I just made the PR to have it ready.

[obahareth]

It looks like the current ar.yml file is using KWD (Kuwaiti Dinar) as the currency, it might be more apt to have it be ar-KW.yml? That might break things for a lot of folks though. I made a new file to avoid breaking anything.

Also I wasn't sure if the convention is to put the currency ISO symbol (e.g. SAR), or the actual new symbol.

[pama]

@obahareth, since maintainers cannot validate every locale, we rely heavily on community contributions, and changes are generally accepted unless someone raises concerns.

I agree with keeping the new locale instead of changing ar.yml.

As for the currency unit, for now I would prefer using SAR instead of introducing a newly added Unicode symbol.

Feel free to update the PR if that works for you.