feat: enable insomnia.test and insomnia.expect in scripting - INS-3637

[ihexxa]

Changes:

• enable insomnia.test and insomnia.expect in scripting, which follows chai assertion interfaces
• added a smoke test for it
• enable replaceIn for environments and variables

How to test:

Pls run this script and see its output in timeline:

insomnia.test('happy tests', () => {
  insomnia.expect(200).to.eql(200);
  insomnia.expect('uname').to.be.a('string');
  insomnia.expect('a').to.have.lengthOf(1);
  insomnia.expect('xxx_customer_id_yyy').to.include("customer_id");
  insomnia.expect(201).to.be.oneOf([201,202]);
  insomnia.expect(199).to.be.below(200);
  // test objects
  insomnia.expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
  insomnia.expect({a: 1, b: 2}).to.have.any.keys('a', 'b');
  insomnia.expect({a: 1, b: 2}).to.not.have.any.keys('c', 'd');
  insomnia.expect({a: 1}).to.have.property('a');
  insomnia.expect({a: 1, b: 2}).to.be.a('object')
    .that.has.all.keys('a', 'b');
});
insomnia.test('unhappy tests', () => {
  insomnia.expect(199).to.eql(200);
  insomnia.expect(199).to.be.oneOf([201,202]);
});