Refactor certificate handling and add key password support

Updated file extension conventions for PEM files and improved attribute handling with stricter checks. Added support for encrypted private keys and clarified SSL operations, ensuring better consistency and maintainability.

Author: YeisonCardona

.github/workflows/python-package.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.13", "3.12", "3.11", "3.10"]
+        python-version: ["3.13", "3.12", "3.11"]
 
     steps:
     - uses: actions/checkout@v4