Django v4.2 support

As part of this release, we're beginning a two-tiered licensing process to encourage sponsorship from users who run this library in a commercial context. All sponsorship dollars go directly to the developer and support continued features and maintenance.

When you're ready to use django-salesforce with Django v4.2, you have a choice between:

• Continue using (https://github.com/django-salesforce/django-salesforce)[the original library], and start a GitHub Sponsorship. You'll receive a license key.
• Switch to this AGPL licensed version of django-salesforce-agpl

What's Changed

• Add: Basic diagnostics after installation can be done by command
  python manage.py check --database=salesforce
• Change: Use with Django 4.2 requires an enterprise license key.
• Add: Support for Django 4.2
• Use API 58.0 Summer '23
• Add: Support for Django Database caching #315
• Fix: Configurable max introspected pick-list size
  SF_MAX_INSPECTDB_PICKLIST_LENGTH #312
  Some people need to introspect huge picklists, some don't want.

New Contributors

• @DmytroLitvinov made their first contribution in django-salesforce/django-salesforce#310

Full Changelog: django-salesforce/django-salesforce@v4.1...v4.2