Added new extended rule object-curly-spacing, thanks to @Kiikurage for the implementation in #1884.

Besides cherry-picking the commit of #1884, I've resolved @bradzacher's comments on the old PR and added a bunch more tests (copied from https://github.com/eslint/eslint/blob/master/tests/lib/rules/object-curly-spacing.js). @bradzacher also left the following comment:

I wonder if you could save all of the code duplication by "hacking" at the base rule?

eg:

TypeLiteral(node): void {
  rule.ObjectExpression({
    ...node,
    properties: node.members,
  } as any);
}

I tried to do this in mpsijm@5a4698e, but it made 10 tests fail. I didn't look too much into the details of the implementation as to see why, but I'm guessing it's because object type literals are more complicated than object expressions. If anyone is interested, you can compare the implementation to the original rule: https://github.com/eslint/eslint/blob/master/lib/rules/object-curly-spacing.js

• tests
• docs
• typing update

Fixes #1784