feat(queries): migrate data queries to the observables

[KutsenkoA]

Old data request syntax:

dataet.select()
  .execute()
  .then(result => {
     // enjoy your result
   })
  .catch(error => // do something with error)

new syntax:

dataset.select()
  .subscribe(result => {
    // enjoy your result
  }, error => // do something with error);

[miss-tique]

🎉 This PR is included in version 4.3.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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