feat(eslint-plugin): add brace-style [extension]

[a-tarasyuk]

Fixes #804

[typescript-eslint]

Thanks for the PR, @a-tarasyuk!

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[bradzacher]

code so far LGTM.
Good work figuring out all of the things to create an extension rule.

I think we probably want to also add support for the other typescript features that can be considered "blocks" whilst we're here.

enums

enum Foo {
  a = 1,
}

namespace / modules

namespace Foo {

}

module Bar {

}

[a-tarasyuk]

@bradzacher ok. Does enum have the property body?

[bradzacher]

It does not - so it'll be just little bit more work to implement.
I'm more than happy to punt on that one for now until someone asks for it!

module/namespace has a body so it should be simple as to add.

[codecov]

Codecov Report

Merging #810 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #810      +/-   ##
==========================================
+ Coverage   94.06%   94.07%   +0.01%     
==========================================
  Files         113      114       +1     
  Lines        4937     4946       +9     
  Branches     1378     1378              
==========================================
+ Hits         4644     4653       +9     
  Misses        166      166              
  Partials      127      127

Impacted Files	Coverage Δ
packages/eslint-plugin/src/rules/brace-style.ts	100% <100%> (ø)
packages/eslint-plugin/src/rules/index.ts	100% <100%> (ø)	⬆️

[a-tarasyuk]

@bradzacher

module/namespace has a body so it should be simple as to add.

Added.

I'm more than happy to punt on that one for now until someone asks for it!

Oke

[bradzacher]

LGTM. Thanks for this