Allow Dynamic Access Key Retrieval and SecretProviderClass Integration

[DaliGossrani]

Currently, the appdynamics-charts requires the access key to be hardcoded, limiting the flexibility and security of the integration. To adhere to best practices and enhance the overall security posture, we need to implement the ability to retrieve access keys dynamically and integrate with the SecretProviderClass. This will allow us to securely fetch secrets from external sources without hardcoding them within the repository.