feat(typescript-estree): support TSv4 labelled tuple members

[bradzacher]

Ref #2260

For simplicity's sake (and because babel has already released their representation), I just went with adding TSNamedTupleMember.

I was considering doing a big breaking change an introducing a new AST node in here to represent all tuple members, instead of having all of the following as valid tuple members TSOptionalType, TSRestType, TSNamedTupleMember, and any TypeNode.
Whilst it will be a much nicer AST to consume, it's probably too large of a change to make...

This PR also updates the versions of babel we test against, and unignores some tests. Doing so uncovered a range bug in import type Foo from 'foo' (the ImportDefaultSpecifier's range included the type keyword).

Finally, I also brought over the compile-time checks added in #2375

[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 #2378 into master will increase coverage by 0.00%.
The diff coverage is 88.23%.

@@           Coverage Diff           @@
##           master    #2378   +/-   ##
=======================================
  Coverage   93.10%   93.11%           
=======================================
  Files         285      285           
  Lines        9125     9134    +9     
  Branches     2504     2505    +1     
=======================================
+ Hits         8496     8505    +9     
  Misses        302      302           
  Partials      327      327           

Flag	Coverage Δ
#unittest	93.11% <88.23%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...nt-plugin/src/rules/no-unused-vars-experimental.ts	91.48% <ø> (ø)
...pt-estree/src/ts-estree/estree-to-ts-node-types.ts	100.00% <ø> (ø)
packages/typescript-estree/src/convert.ts	98.36% <85.71%> (+0.01%)	⬆️
...ckages/scope-manager/src/referencer/TypeVisitor.ts	89.55% <100.00%> (+0.15%)	⬆️
packages/visitor-keys/src/visitor-keys.ts	100.00% <100.00%> (ø)

[longlho]

This seems to be a breaking change since TS@3.x does not have NamedTupleMember

[bradzacher]

See discussion in #2388