Refactor lmn_wlan role

- Consolidate `lmn_wlan`, `lmn_wlan_nm`, and `lmn_wlan_8021x` into single `lmn_wlan` role.
- Implement a check for the availability of the radius-server during the EAP-TLS rollout.
- Enhance variable support with a standardized naming schema:
    - Mode selection via `wlan` variable (`none`, `psk`, `eap-tls`).
    - EAP-TLS CA configuration (CA information, email address, CA password).
    - Introduce a switch to force the (re-)issue of existing certificates.
    - PSK configuration through `wlan_ssid` and `wlan_password`.
- Add a check to verify if the radius certificate is revoked.
- Ensure required packages and services are only installed and configured if the `wifi` variable is set.

roles/lmn_wlan/defaults/main.yaml

@@ -0,0 +1,13 @@
+---
+wlan: none
+wlan_force_issue: false
+wlan_ssid: "Linux-Wlan"
+wlan_password: "VerySecurePassw0rd"
+wlan_eap_ca:
+  C: "DE"
+  ST: "Baden-Wuerttemberg"
+  L: "Reutlingen"
+  O: "Linuxschule"
+  emailAddress: "admin@example.com"
+  CN: "Radius Certificate Authority"
+  password: "OtherVerySecurePassw0rd"