implement nationalities system / added countries.json

[SNAILX808]

Description

implemented nationalities system

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Implementation Details

• Integrated nationality data into player data structure in es_extended
• Nationality stored as string identifier in database for flexibility
• stored nationalities in countries.json
• Added server-side security check to validate only countries listed in countries.json

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Usage Example

-- client-side usage 
ESX.GetPlayerData().nationality

-- server-side usage
-- get nationality
xPlayer.getNationality()
or 
xPlayer.nationality
-- set nationality
xPlayer.setNationality("esx")

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PR Checklist

• My commit messages and PR title follow the Conventional Commits standard.
• My changes have been tested locally and function as expected.
• My PR does not introduce any breaking changes.
• I have provided a clear explanation of what my PR does, including the reasoning behind the changes and any relevant context.

[Zuntie]

Use the cb param to send the data. So something like cb({ data = Config }) No need to have another event sending the config, unnecessary.

Yep, that's a good idea. Thank you very much! Slipped my mind.

[Zykem]

Use the cb param to send the data. So something like cb({ data = Config }) No need to have another event sending the config, unnecessary.

[Zykem]

Tested, LGTM

[CLAassistant]

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2 out of 3 committers have signed the CLA.

✅ SNAILX808
✅ Kenshiin13
❌ Zykem
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