[sonos] Add speechenhancement channel for Sonos One

[mindstorms6]

[sonos] - Add speechancement channel to Sonos One devices because they also have a Mic ( https://www.sonos.com/en-us/shop/one.html )

Just adds the existing speechenhancement property to the Sonos One Devices - they also have a built in microphone for use with Alexa/Google Assistant.
The same channel and handlers already existed for other sonos devices.
Also updated the README to reflect this change.

[mindstorms6]

I wasn't sure if it's useful to split/create a new thing for the OneSL versus the One.

[TravisBuddy]

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[TravisBuddy]

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[lolodomo]

One and OneSL are sharing the same thing type. Take a look in the discovery code.
So if the channels are now different between One and OneSL, yes I think we should split them and create a new thing type for OneSL.

[mindstorms6]

Hey thanks for the feedback @lolodomo

Looks like we intentionally collapse the One SL into the One thing type:

openhab-addons/bundles/org.openhab.binding.sonos/src/main/java/org/openhab/binding/sonos/internal/discovery/ZonePlayerDiscoveryParticipant.java

Lines 88 to 90 in 7628135

	case "One SL":
	modelName = "One";
	break;

I'm happy to remove this and add a separate thing for the OneSL - but my only concern is I don't have a One SL currently so my real world testing will be relying on someone who has one.

I'll make the changes requested. Thanks!

[lolodomo]

LGTM

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[TravisBuddy]

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Hey @mindstorms6,
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Hey @mindstorms6,
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[TravisBuddy]

Travis tests were successful

Hey @mindstorms6,
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[cpmeister]

LGTM