feat: add key management API integration to SDK

[subhayu99]

Motivation

I needed to use the KMS key management capabilities in the SDK, but since they were not available, I implemented the feature myself based on the existing REST API. If this can be reviewed and merged ASAP, it would be greatly helpful for my ongoing work.

---

Key Changes:

• New Data Models Added (api_types.py):

  • BaseKey, ListKey, ListKeysResponse, SingleKeyResponse, EncryptDataResponse, DecryptDataResponse.
  • These models represent responses from the REST API for KMS key management operations.

• Key Management Client (client.py):

  • Added the V1Keys class to handle KMS key management operations via the REST API.
  • Methods implemented:
    • list_keys: List keys with pagination, search, and sorting support.
    • create_key: Create a new KMS key with optional description and encryption algorithm specification.
    • update_key: Update key attributes such as name, description, and active status.
    • delete_key: Delete a KMS key. (Note: The DELETE endpoint returned a 500 Internal Server Error during testing.)
    • encrypt_data: Encrypt plaintext using a specified KMS key.
    • decrypt_data: Decrypt ciphertext using a specified KMS key.
  • The V1Keys class has been integrated into the InfisicalSDKClient as self.keys.

---

Impact:

• Expands the SDK's capabilities by integrating key lifecycle management and encryption operations using the REST API.
• Enables direct interaction with KMS endpoints for secure key handling and data encryption.

---

Testing:

• Verified REST API interactions for key creation, update, encryption, and decryption.
• Known Issue: The DELETE endpoint returned a 500 Internal Server Error during testing, preventing successful validation of the delete_key method.

---

Next Steps:

• Confirm the DELETE endpoint issue with the API team.
• Verify compatibility with existing SDK features.
• Update the documentation with usage examples for key management.
• Add additional test coverage for edge cases once the DELETE endpoint issue is resolved.

[subhayu99]

@maidul98, @DanielHougaard

If you guys have time, please review this PR.

[varonix0]

Hi @subhayu99, this was added in #28, so I will close this PR. Thank you for the contribution!