Added profile for Shelly EM

[michalk-k]

Device information

Home Assistant Device information

Checklist

• I have created a single PR per device. When you have multiple submissions please create separate PR's.
• For lights - I have only included the gzipped files (*.gz), not the raw CSV files.
• For lights - I have provided a CSV file per supported color mode. Look that up in Developer Tools -> States

Additional info

• I've changed order of attributes, grouping them together by the meaning.
• I made use of measure_settings even though I was using a manual method (own script scrapping data from measurement device)

[bramstroker]

Please use the new recommended format as explained for scenarios here:
https://docs.powercalc.nl/library/device-types/smart-switch/#smart-switch-with-built-in-powermeter

So you can use standby_power_on for this and get rid of fixed_config

I will migrate all the other smart switch profiles to this definite profile format soon.

[bramstroker]

Approved. Will merge after 1.17 release.
Will probably release next weekend.

[michalk-k]

I need to revert only_self_usage to false :)
Your confidence confused me ;)

Shelly EM has 2 measurement clamps, and on top of this, it has a relay not equipped with measurement.
The only_self_usage = false is intended to add fixed/linear energy switched by this switch.

May I add a commit yet to this PR?