chore(docgen): remove constructorName property

[layershifter]

Cut from #509.

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This PR removes the constructorName property from our docgen task. This property is used only in our tests and blocks the usage of HOC, refs #509.

Props

• we omit require(absPath).default in docgen task, this require is handled by ts-node so it will increase performance (even in CI 1:30 -> 1:12 for the Unit Tests task)
• unblocks the usage of HOCs in our components

Cons

• isConformant() now has one more argument. However it's not a real issue. BTW, componentName will be compared with displayName, so there is a really small change to get a typo

[DustyTheBot]

	Warnings
⚠️	There are no updates provided to CHANGELOG. Ensure there are no publicly visible changes introduced by this PR.

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[levithomason]

For now, we'll close this PR. We won't wrap all components with the forwardRef HOC just yet. We're going to let the community figure out what the final solution is on refs before doing anything drastic.

[layershifter]

But we want still to get rid of this require(), #589.