Add Support for Control Your Own Key (CYOK) and Bring Your Own Key (BYOK) Features with New `EncryptionKeyManager`

[developerkunal]

🔧 Changes

This PR introduces a new EncryptionKeyManager to manage encryption keys using the Auth0 Management API, with added support for Control Your Own Key (CYOK) and Bring Your Own Key (BYOK) features. The following methods have been added:

• Create: Creates a new encryption key.
• List: Lists all existing encryption keys.
• Read: Reads an encryption key by its key ID.
• Rekey: Performs a rekeying operation on the key hierarchy.
• Delete: Deletes an encryption key by its key ID.
• ImportWrappedKey: Imports wrapped key material and activates the encryption key.
• CreatePublicWrappingKey: Creates a public wrapping key to wrap encryption key material.

📚 References

• Create: Creates a new encryption key.

  • API Documentation

• List: Lists all existing encryption keys.

  • API Documentation

• Read: Reads an encryption key by its key ID.

  • API Documentation

• Rekey: Performs a rekeying operation on the key hierarchy.

  • API Documentation

• Delete: Deletes an encryption key by its key ID.

  • API Documentation

• ImportWrappedKey: Imports wrapped key material and activates the encryption key.

  • API Documentation

• CreatePublicWrappingKey: Creates a public wrapping key to wrap encryption key material.

  • API Documentation

Each method integrates directly with the Auth0 Management API, allowing for full lifecycle management of encryption keys.

🔬 Testing

Test Summaries for EncryptionKeyManager

1. TestEncryptionKeyManager_Create: Verifies that an encryption key can be created successfully.

2. TestEncryptionKeyManager_List: Confirms that the List method retrieves all encryption keys.

3. TestEncryptionKeyManager_Read: Ensures that an encryption key can be read by its key ID.

4. TestEncryptionKeyManager_Rekey: Validates that the Rekey method correctly rekeys the key hierarchy.

5. TestEncryptionKeyManager_Delete: Tests that an encryption key can be deleted and its state becomes "destroyed."

6. TestEncryptionKeyManager_CreatePublicWrappingKey: Checks that a public wrapping key is generated successfully.

7. TestEncryptionKeyManager_ImportWrappedKey: Confirms that wrapped key material can be imported and activated.

📝 Checklist

• [x] All new/changed/fixed functionality is covered by tests (or N/A)
• [x] I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.10390% with 3 lines in your changes missing coverage. Please review.

Project coverage is 95.64%. Comparing base (88dff30) to head (fc9c263).

Files	Patch %	Lines
management/encryption_key.go	91.17%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #435 +/- ## ======================================= Coverage 95.64% 95.64% ======================================= Files 48 49 +1 Lines 8081 8158 +77 ======================================= + Hits 7729 7803 +74 - Misses 235 238 +3 Partials 117 117 ```

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