Add channel related metadata columns about types HOT 7 CLOSED

How is channel added to lbry now?

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Check out this documentation on channels/schema, maybe it will help:https://github.com/lbryio/lbryschema/tree/master/docs

A channel is created via the Publish screen right now - all that's really captured is a channel name. I think this would lay the initial groundwork to be able to capture additional information when channels are created.

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Just came into my mind now that we are working on cleaning up NFSW: Should there be an NFSW setting on channels? What if a channel uses an NSFW thumb - how would we know not to display that.

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We need channel attributes but I am disinclined to double-down on the poor choice that was a single boolean property called is_nsfw.

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We can discuss what else to call this self imposed categorization, both on channels and claims. I think this is outside of the opt in filtering to tags idea we've tossed around.

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we should consider this after the signature changes

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moving discussion to #17

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