Add self-clean (DPS 111) to Teknopoint Idra Skiv (#5512)

* Add self-clean (DPS 111) to Teknopoint Idra Skiv air conditioner

DPS 111 (standard Tuya "cleaning" Boolean for category kt) activates the
self-clean cycle on the Teknopoint IDRA / EVO-09 indoor unit. The unit
displays "SC" on its panel and runs a freeze/defrost evaporator cleaning
cycle (~13 minutes), then turns off automatically.

Tested on 4 units (EVO-09 with IDRA iSKV4-28C9 water-cooled condenser)
via tuya-local debug logging: DPS 111 confirmed present in full_poll
responses. Setting DPS 111 to true activates the cycle; the split reports
hvac_mode heat_cool during the cycle and DPS 111 returns to false on
completion.

Note: This is separate from the IR remote's CLEAN button, which triggers
a simpler fan-only drying cycle and does not change any Tuya DPS.

* Add optional field to switch in air conditioner config

---------

Co-authored-by: Jason Rumney <make-all@users.noreply.github.com>

custom_components/tuya_local/devices/idra_skiv_airconditioner.yaml

@@ -342,3 +342,12 @@ entities:
       - id: 113
         type: bitfield
         name: fault_code2
+  - entity: switch
+    name: Self clean
+    icon: "mdi:air-filter"
+    category: config
+    dps:
+      - id: 111
+        name: switch
+        type: boolean
+        optional: true