Add KL400L5 color temperature range (#1719)

- add the KL400L5 color temperature range used by newer firmware
- add a KL400L5(US) 1.0.11 fixture that reports variable color
temperature support
- categorize that fixture as variable color temperature while keeping
older KL400L5 fixtures non-variable
- The Tapo app exposes 2500K-9000K for these KL400L5 strips, so this PR
uses that app-visible range.

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

kasa/iot/iotbulb.py

@@ -90,6 +90,7 @@ TPLINK_KELVIN = {
     "KL135": ColorTempRange(2500, 9000),
     r"KL120\(EU\)": ColorTempRange(2700, 6500),
     r"KL120\(US\)": ColorTempRange(2700, 5000),
+    r"KL400L5": ColorTempRange(2500, 9000),
     r"KL430": ColorTempRange(2500, 9000),
 }