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

pyproject.toml

@@ -7,7 +7,7 @@ name = "chaski-confluent"
 version = "0.1a8"
 description = "Chaski Confluent"
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 license = { text = "BSD-2-Clause" }
 authors = [
     { name = "Yeison Cardona", email = "yencardonaal@unal.edu.co" }
@@ -25,7 +25,6 @@ classifiers = [
     "Natural Language :: English",
     "Operating System :: OS Independent",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",