Add query pagination

[ampatspell]

Have multiple queries. 1st loads with limit, next one does startAfter. Put all queries in @activate() array.

let ref = store.collection('ducks').orderBy('name', 'asc').limit(50);
let queries = [];
queries.push(ref.query());
queries.push(ref.startAfter(queries[0].content.lastObject).query());