Support for overlaps json operator

Suggestion

The connector support the "contains" json/array operator. This operator select rows which contain ALL value in the array.
I propose the support the "overlaps" json/array operator. This operator select rown which contain ANY value in the array.

Use Cases

With this feature, you will be able to use the JSON Array [array operator &&] operator from PostgreSQL(https://www.postgresql.org/docs/current/functions-array.html).

Examples

Row 1: [ A, B]
Row 2: [C, D]
Row 3: [E, A, B ]
Look for any row which overlaps with [C, F] => Should return Row 2

Acceptance criteria

• Doc
• Test
• Code

It is very easy to implement. Unfortunately, I don't know how to use correctly GitHub for PR. So, I can provide code, and i hope someone will be able to PR it.

/test/postgresql.test.js line 294 -------------

 it('should support the "overlaps" where filter for array type field', async () => {
    await Post.create({
      title: 'Overlaps: LoopBack Participates in Hacktoberfest',
      categories: ['OL_LoopBack', 'OL_Announcements'],
    });
    await Post.create({
      title: 'Overlaps: Growing LoopBack Community',
      categories: ['OL_LoopBack', 'OL_Community'],
    });

    const found = await Post.find({where: {and: [
      {
        categories: {'overlaps': ['OL_Super', 'OL_Community']},
      },
    ]}});
    found.map(p => p.title).should.deepEqual(['Overlaps: Growing LoopBack Community']);
  });

/lib/postgresql.js, line 553 ------------------------------------------------------

case 'overlaps':
  return new ParameterizedSQL(columnName + ' && array[' + operatorValue.map(() => '?') + ']::'
    + propertyDefinition.postgresql.dataType,
  operatorValue);
case 'contains':
  return new ParameterizedSQL(columnName + ' @> array[' + operatorValue.map(() => '?') + ']::'
    + propertyDefin

README.md line 601---------------------------------------------------

Operator overlaps
The overlaps operator allow you to query array properties and pick only
rows where the stored value contains any of the items specified by the query.
The operator is implemented using PostgreSQL array operator &&.
Note The fields you are querying must be setup to use the postgresql array data type - see Defining models above.

Inizia dalla gestione esistente degli operatori degli array vicino alla riga 553 di lib/postgresql.js e dai casi correlati in test/postgresql.test.js. Aggiungi la copertura per le sovrapposizioni in cui filter usa l'esempio dell'issue, quindi aggiorna la documentazione degli operatori intorno alla riga 601 di README.md. Il lavoro è completato quando il test passa e il comportamento di sovrapposizione degli array di PostgreSQL è documentato.