Disable video previews in comments/posts made by channels below a certain channel staked level

[neb-b]

We would like to start disabling video/image previews in comments if the creator of the comment has < x LBC staked to their channel. This is the first feature that will be turned on based on LBC staked so some things will need to be moved around.

• This function should be moved to a selector makeSelectStakedLevelForChannelUri and added to redux/selectors/claims.js in lbry-redux.

• MarkdownPreview should accept a new prop displayClaimPreviews that is defaulted to false, and only true when the creator channel is at level 4 or greater.

• When a claim preview can't be displayed because of insufficient staked amount, just render a regular link with a tooltip. The tooltip can say something like "This channel isn't staking enough :LBC: for link previews".

• The UI for lbry.tv/desktop should not show anything about a channels "level". Levels are only for odysee.

[kauffj]

@seanyesmunt will flesh out and hand to @infinite-persistence

[neb-b]

@infinite-persistence I updated this issue. Let me know if you have any questions.