add element.get(its.executeScript(...)) and element.perform(its.executeScript(...))

[alex-popov-tech]

The idea is to get rid of element.executeScript from the api to make it shorter, and at the same time be able to add its.executeScript to use when you want to execute script as an command, or a query inside a promise chain. Also as a benefit, we wrap passed script into an annon function, and at the same time implicitly pass there
Example:

const value = await element.should(be.visible).then(get.executeScript('element.value'))
const myhref = await element.should(have.attribute('href'))
  .then(perform.executeScript('element.value = arguments[0]', 'mynewhref')
  .then(get.attribute('href'))