feat: enhance provider and deduplication rule provisioning logic

[tuantran0910]

Closes #4401

📑 Description

When Keep starts or restarts, it follows these steps to manage provider configurations:

1. Read Configurations: Loads provider definitions from either the KEEP_PROVIDERS environment variable or YAML files in the KEEP_PROVIDERS_DIRECTORY.
2. Create New Providers: Installs any providers listed in the configuration that are not already present.
3. Update When Changed: If an existing provider's configuration has changed, Keep reapplies the configuration, including deduplication rules. If errors occur during this update, changes are automatically rolled back.
4. Delete Providers: Deletes any currently installed providers that are not found in the loaded configuration.

✅ Checks

• [x] My pull request adheres to the code style of this project
• [x] My code requires changes to the documentation
• [x] I have updated the documentation as required
• [x] All the tests have passed