feat(eslint-plugin): optional chain support in rules (part 1)

[bradzacher]

See #1051

• consistent-type-assertions
• explicit-function-return-type
• func-call-spacing
• no-array-constructor
• no-floating-promises
• no-inferrable-types
• no-misused-promises
• no-require-imports
• no-var-requires
• prefer-for-of
• prefer-includes

[typescript-eslint]

Thanks for the PR, @bradzacher!

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!

---

🙏 Please, if you or your company is finding typescript-eslint valuable, help us sustain the project by sponsoring it transparently on https://opencollective.com/typescript-eslint. As a thank you, your profile/company logo will be added to our main README which receives thousands of unique visitors per day.

[codecov]

Codecov Report

Merging #1253 into master will decrease coverage by <.01%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##           master    #1253      +/-   ##
==========================================
- Coverage   94.22%   94.22%   -0.01%     
==========================================
  Files         129      129              
  Lines        5611     5627      +16     
  Branches     1575     1581       +6     
==========================================
+ Hits         5287     5302      +15     
  Misses        180      180              
- Partials      144      145       +1

Impacted Files	Coverage Δ
...ages/eslint-plugin/src/rules/no-require-imports.ts	100% <ø> (ø)	⬆️
...ges/eslint-plugin/src/rules/no-misused-promises.ts	100% <ø> (ø)	⬆️
...es/eslint-plugin/src/rules/no-array-constructor.ts	100% <ø> (ø)	⬆️
...int-plugin/src/rules/consistent-type-assertions.ts	87.09% <ø> (ø)	⬆️
packages/eslint-plugin/src/rules/prefer-for-of.ts	88.57% <ø> (ø)	⬆️
...ackages/eslint-plugin/src/rules/prefer-includes.ts	100% <100%> (ø)	⬆️
...-plugin/src/rules/explicit-function-return-type.ts	100% <100%> (ø)	⬆️
packages/eslint-plugin/src/util/astUtils.ts	100% <100%> (ø)	⬆️
...ges/eslint-plugin/src/rules/no-inferrable-types.ts	93.1% <100%> (ø)	⬆️
...ackages/eslint-plugin/src/rules/no-var-requires.ts	100% <100%> (ø)	⬆️
... and 1 more