feat(locale): add mr_IN person, address, and phone_number providers

[RedZapdos123]

Changes done:

Adds Marathi locale support under mr_IN with these providers:

• person
• address
• phone_number
• date_time

It also adds tests in existing suites:

• tests/providers/test_person.py (TestMrIN)
• tests/providers/test_address.py (TestMrIn)
• tests/providers/test_phone_number.py (TestMrIn)
• tests/providers/test_date_time.py (TestMrIN)

The problem:

mr_IN was missing as a dedicated locale.

The solution:

• Adds faker/providers/person/mr_IN/__init__.py with Marathi first names, last names, prefixes, and suffixes.
• Adds faker/providers/address/mr_IN/__init__.py with Marathi city/state/country datasets and India-style address formats.
• Adds faker/providers/phone_number/mr_IN/__init__.py with Indian style +91 and local variants.
• Adds faker/providers/date_time/mr_IN/__init__.py with Marathi DAY_NAMES, MONTH_NAMES, day_of_week(), and month_name().
• Extends tests to validate provider datasets and locale behavior, including prefix/suffix, and day/month checks.

Fixes #2355

Validation:

• make lint.
• pytest tests/providers/test_person.py -k MrIN -q
• pytest tests/providers/test_address.py -k MrIn -q
• pytest tests/providers/test_phone_number.py -k MrIn -q
• pytest tests/providers/test_date_time.py -k MrIN -q
• pytest tests/providers/test_person.py tests/providers/test_date_time.py tests/providers/test_address.py tests/providers/test_phone_number.py -q

Result: 785 passed, 3 skipped.

AI Assistance Disclosure (REQUIRED):

• No AI tools were used in preparing this PR.
• If AI tools were used, I have disclosed which ones, and fully reviewed and verified their output.

Disclosure: GitHub Copilot (GPT-5.3-Codex) was used to help draft and implement code/test changes and PR text. All outputs were manually reviewed, edited, and validated through linting and test execution.

Checklist:

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

The validation screenshots of the tests run, locally on WSL:

[RedZapdos123]

Data sources:

• Marathi given first names: https://www.behindthename.com/names/usage/marathi.

• Marathi surnames: https://en.wikipedia.org/wiki/Category:Marathi-language_surnames.

• Maharashtrian cities: https://en.wikipedia.org/wiki/List_of_cities_in_Maharashtra_by_population.

• Indian States in Marathi: https://www.india.gov.in/my-government/states-uts or Marathi Wikipedia page of Indian States

• Country names in Marathi: https://github.com/unicode-org/cldr-json/blob/main/cldr-json/cldr-localenames-full/main/mr/territories.json.

• Phone numbers: https://dot.gov.in/numbering-resources, along with the alignment with existing Faker IN phone format conventions.

• Marathi weekdays source: https://mr.wikipedia.org/wiki/वार

• Marathi months source: https://mr.wikipedia.org/wiki/महिने

(Since I have Marathi friends, and have lived in the Maharashtra State, I have confirmed the quality of the data.)

[fcurella]

Thank you!