feat: add object shorthand property mutator

[brody4hire]

As I said before, I have been using Stryker pretty heavily and happily in my create-react-native-module utility. I have discovered a few cases over the past year where there were object properties that were simply not needed, sometimes because of functionality removed and sometimes for other reasons. Yes I am the one to be held responsible but think it should be possible for Stryker to help find cases like this.

In short, this is a proposal to try removing shorthand object properties, for example:

• { bar, baz: "quz" } --> { baz: "quz" }

Here are a couple of cleanup fixes that could have been discovered by using this proposal:

• remove library API support for namespace brody4hire/create-react-native-module#276
• cleanup example template render arguments brody4hire/create-react-native-module#328

I made this proposal on the JavaScript mutator only, would be happy to take a look into the TypeScript version in case there is any interest. I do think it would be ideal to consider using @typescript/eslint-parser which should let us work with the TypeScript parser without having to maintain multiple implementations of the ES mutators.

TODO items updated:

• ensure the CI build is green (yes I did check lint & test in my workarea)
• consider looking for a more succinct name
• consider if and how this could potentially overlap with other mutations and what we can do
• add implementation for TypeScript mutator
• update Stryker Handbook

P.S. I would highly recommend a squash commit merge in case this proposal is accepted.

[simondel]

See #2172