Add new model of TS0121 Tuya plug

[Adminiuga]

Add a new model of TS0121 Tuya plug.
Fixes #1299
I don't have such a plug so this needs testing to confirm it is working correctly.

[coveralls]

Pull Request Test Coverage Report for Build 1733468101

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 80.523%

---

Totals
Change from base Build 1708660039:	0.01%
Covered Lines:	4647
Relevant Lines:	5771

---

💛 - Coveralls

[ali1234]

This certainly causes the quirk to be applied to my devices. The custom clusters are now shown in the cluster manager. The cluster manager works now and I can get the value of current_divisor, and it is 1000 as expected when the quirk is activated.

Tomorrow I will verify that the readings really are correct using my 2kW fan heater.

[ali1234]

After running heater for 6 minutes I have this:

These readings seem to be correct.

[codecov-commenter]

Codecov Report

Merging #1300 (66bb3b8) into dev (dcee551) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1300      +/-   ##
==========================================
+ Coverage   80.51%   80.52%   +0.01%     
==========================================
  Files         212      212              
  Lines        5768     5771       +3     
==========================================
+ Hits         4644     4647       +3     
  Misses       1124     1124              

Impacted Files	Coverage Δ
zhaquirks/tuya/ts0121_plug.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dcee551...66bb3b8. Read the comment docs.

[javicalle]

LGTM