Feature: add object shorthand for mapStateToProps in connect

[GregoryNative]

I found it useful for myself.

Same as we use shorthand for mapDispatchToProps in connect, it's also possible to do for mapStateToProps using reselect library. It's good 1 file library, and even mentioned in redux here:
https://redux.js.org/recipes/computing-derived-data#selectorsindexjs

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[markerikson]

Hi. Appreciate the PR. This was previously attempted in #323 , #723 , and #724 . Ultimately, we decided that there was too much complexity in how this could work, and that it was not a feature we wanted to add.

We will continue to maintain connect in general, but at this point we're recommending that folks use the hooks API as the default approach, so I don't see a need to add more features to connect.

In addition, our implementation has avoided any additional external dependencies like reselect, and we're not going to add another dependency for a rarely-used feature.

[GregoryNative]

Np