[SQL Lab] Show tooltip on schema and table select options (#7120)
[SQL Lab] Show tooltip on schema and table select options (#7120)

Closes #7119
airbnb/superset,apache/incubator-superset,apache/incubator-superset,airbnb/superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,mistercrunch/panoramix,mistercrunch/panoramix,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/caravel,airbnb/superset,zhouyao1994/incubator-superset,apache/incubator-superset,apache/incubator-superset,airbnb/superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,mistercrunch/panoramix,airbnb/caravel,apache/incubator-superset