Add documentation on the SetEntityState service

[azeey]

🎉 New feature

Builds on top of #652

Summary

Also adds some warnings about the use of the service for setting twists on Harmonic.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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[ahcorde]

Something is wrong here. This PR is the same as #652 but the branch names are different.

Did you push your code in the rithg brnahc @azeey ?

Also the title doesn't correspond with the content

[azeey]

It had one additional commit on top of #652. When working from a fork, it's not possible to target an existing PR, so I had to include all of #652 and the additional commit in this PR. Now that #652 is merged, I have rebased and this can now be reviewed on its own.