Generate random tagId used to start transaction from UI

[rinigus]

Instead of disabling authorization for start_transaction initiated via HA user, use a random generated tag and authorize it to start transaction.

This PR started as the following code was not disabling authorization on ABB charger:

        resp = await self.get_configuration(ckey.authorize_remote_tx_requests.value)
        if resp is True:
            await self.configure(ckey.authorize_remote_tx_requests.value, "false")

I presume it is due to comparison between resp and True (is resp a string?).

However, we don't even have to disable authorization in this case. It is sufficient to generate a random tag on initialization and use it for such transactions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.30%. Comparing base (d8f4b7e) to head (074205d).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1302      +/-   ##
==========================================
+ Coverage   91.10%   91.30%   +0.19%     
==========================================
  Files           9        9              
  Lines        1383     1391       +8     
  Branches      222      223       +1     
==========================================
+ Hits         1260     1270      +10     
+ Misses         66       65       -1     
+ Partials       57       56       -1     

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