feat(eslint-plugin): add object-curly-spacing rule

[mpsijm]

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

[typescript-eslint]

Thanks for the PR, @mpsijm!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[codecov]

Codecov Report

Merging #2892 (f9f0e7e) into master (d02a40d) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2892      +/-   ##
==========================================
+ Coverage   92.78%   92.81%   +0.03%     
==========================================
  Files         311      312       +1     
  Lines       10458    10508      +50     
  Branches     2954     2969      +15     
==========================================
+ Hits         9703     9753      +50     
  Misses        348      348              
  Partials      407      407              

Flag	Coverage Δ
unittest	92.81% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/eslint-plugin/src/configs/all.ts	100.00% <ø> (ø)
...es/eslint-plugin/src/rules/object-curly-spacing.ts	100.00% <100.00%> (ø)

[bradzacher]

LGTM - thanks for picking this back up!