[FEATURE] Add Job provider and mixin

[Pythonian]

Provider or Method Request or Enhancement

• Request Type: New Provider and Mixin

Describe the New Provider or Feature

• Provider name: JobProvider
• Mixin name: Job
• Description: A Job provider/mixin combination which would allow for generating random jobs common to the Nigerian environment. This can either be implemented as a standalone provider or as a part of a MiscProvider, exposed as a mixin method (e.g., naija.job()).

Examples and Use Cases

  from fakernaija.faker import Faker
  naija = Faker()
  job = naija.job()
  print(job) # Outputs: Salesperson

Documentation Update
The documentation should be updated to include the new provider/mixin, along with examples of how to use the job() method.