Add features for newer vacuums (eg Roborock S7)

[fettlaus]

I added the following features to the vacuums. Support for them may vary depending on the model of the vacuum. All of these at least work for the Roborock S7

• mopping mode/route can be changed (does multiple passes on deep clean)
• can detect if the mop is attached (as opposed to detection of attached water box)
• fanspeeds for Roborock S7 added
• child lock can be switched on and off
• water shortage on the water box can be queried if the vacuum has a sensor for this
• carpet cleaning mode/avoidance can be changed (see Add setting for carpet avoidance to vacuums #1040)

Closes #1040

[rytilahti]

A couple of more comments, but otherwise this looks good to go. I'm unsure if the best action for unsupported actions is to raise an exception or simply to log it, but let's go for logging for now to make it simpler for downstreams.

The vacuum class (when the API gets consolidated) should get a supported_features() property at some point to allow introspecting which commands and features are available for the given model. Until then, I think it's better to (non-silently) signal for invalid usage instead of raising an exception.

[rytilahti]

Let's merge it, thanks again for the PR and your patience! 🥇