0.2.0

Refactor CA and certificate management

- Removed unused modules and code related to private keys and certificate loading.
- Introduced new modules for managing CA data, including loading, saving, and indexing.
- Updated settings to use a configuration path instead of a temporary directory.
- Implemented functions for generating CA and client certificates, including CRLs and PKCS#12 files.
- Added functionality to read and write serial numbers and CRL numbers.
- Enhanced error handling and improved code organization for better maintainability.