Refactor utils.addChainableMethod helper

[shvaikalesh]

Use Object.setPrototypeOf instead of __proto__

• Object.setPrototypeOf is more strict than __proto__: it throws on failure instead of being silent.
• __proto__ is in Annex B of the spec; using it is kinda discouraged.

This annex describes various legacy features and other characteristics of web browser based ECMAScript implementations. All of the language features and behaviours specified in this annex have one or more undesirable characteristics and in the absence of legacy usage would be removed from this specification.

• I would avoid relying on early implementations of __proto__ (before it was defined on Object.prototype) .
• Object.setPrototypeOf reads better 😄.
• Every browser we support, has either both __proto__ and Object.setPrototypeOf or neither of them.

When we drop IE < 11, we would simplify addChainableMethod even more.

Remove hardcoded non-configurable function keys

They used to cause troubles in ancient IEs, but work fine in IE.

[meeber]

LGTM

[shvaikalesh]

I've updated the PR with perf improvement:

We get list of non-configurable props on functions only once and then only indexOf in hot code.
Internet Explorers would love that.

[meeber]

Seems like a good improvement. Still LGTM.

[vieiralucas]

Very good explanation 😄
LGTM

[lucasfcosta]

LGTM!