salesforce: use query method-chain syntax

jsforce exposes a method chain query syntax, like this:

conn.sobject("Contact")
  .find(
    // conditions in JSON object
    { LastName : { $like : 'A%' },
      CreatedDate: { $gte : jsforce.Date.YESTERDAY },
      'Account.Name' : 'Sony, Inc.' },
    // fields in JSON object
    { Id: 1,
      Name: 1,
      CreatedDate: 1 }
  )
  .sort({ CreatedDate: -1, Name : 1 })
  .limit(5)
  .skip(10)
  .execute(function(err, records) {
    if (err) { return console.error(err); }
    console.log("fetched : " + records.length);
  });

Instead of relying on taking a query as a SOQL string, we should allow the find to be specified as a JSON object which defiens teh query criteria. We can also take options for sort, limit, skip etc.

Basically the idea would be instead of having to write this:

query(`SELECT Name, Email, (SELECT Campaign_Tag_Name__c FROM CampaignMembers
  WHERE Campaign.RecordType.Name = 'Grupos, RTs ou Áreas Temáticas' and  Campaign.IsActive = true)
FROM Contact
WHERE Id in (SELECT Contact__c FROM Deleted_Campaign_Member__c WHERE CreatedDate > ${state.lastSyncTime})
`)

Users can do something like tthis:

query({
  from: 'Contact',
  select: ['Name', 'Email', ''<nested query?>"] // maps to fields in find
  where: {
    CreatedDate:  { $gte : state.lastSyncTime },
 }
});

This is over-simplified because I don't know how the nested queries would work. But we should really be aspiring to building queries as JSON objects rather than SOQL strings