Summary

This Pull Request implements two related features to significantly improve the ⁠ en_NG ⁠ (Nigerian English) locale coverage:

1. Phone Number Provider: Adds comprehensive and up-to-date mobile phone number prefixes (including newer 090, 091, 0900 series) to the ⁠ phone_number ⁠ provider.
2. Person Provider Balance: Introduces a balanced set of first names (both male and female) across the major Nigerian ethnic groups (including Yoruba, Igbo, and Hausa etc) to ensure a more representative data set.

Both contributions strictly follow the "only make changes to locales you are familiar with" guideline.

Compliance Note for Reviewers

⁠*AI Disclosure:*
⁠* *Tool Used:* ChatGPT.
⁠* *Usage:* The AI was used to identify missing phone number prefixes and to suggest a culturally balanced initial list of names, and to verify strict adherence to the project's ⁠ CONTRIBUTING.rst ⁠ workflow. The human contributor manually verified the data accuracy and ran all required tests.

⁠Meaning of Life: Try to be nice to people, avoid eating fat, read a good book every now and then, get some walking in, and try and live together in peace and harmony with people of all creeds and nations. P != NP.

Checklist

• I have read the documentation about CONTRIBUTING
• I have read the documentation about Coding style
• I have run make lint