ARROW-4396: [JS] Update Typedoc for TypeScript 3.2

[trxcllnt]

Closes https://issues.apache.org/jira/browse/ARROW-4396

[codecov-io]

Codecov Report

Merging #3506 into master will decrease coverage by 10.69%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3506      +/-   ##
==========================================
- Coverage   80.67%   69.97%   -10.7%     
==========================================
  Files         129      376     +247     
  Lines        8967    51629   +42662     
  Branches     1069     1069              
==========================================
+ Hits         7234    36128   +28894     
- Misses       1618    15495   +13877     
+ Partials      115        6     -109

Impacted Files	Coverage Δ
js/src/ipc/node/iterable.ts	100% <ø> (ø)	⬆️
js/src/ipc/node/writer.ts	100% <ø> (ø)	⬆️
js/src/ipc/metadata/message.ts	91.4% <ø> (ø)	⬆️
js/src/visitor/vectorctor.ts	89.06% <ø> (ø)	⬆️
js/src/util/utf8.ts	77.77% <ø> (ø)	⬆️
js/src/visitor/toarray.ts	98.3% <ø> (ø)	⬆️
js/src/visitor/indexof.ts	97.26% <ø> (ø)	⬆️
js/src/visitor/set.ts	100% <ø> (ø)	⬆️
js/src/Arrow.ts	100% <ø> (ø)	⬆️
js/src/visitor/typeassembler.ts	99.04% <ø> (ø)	⬆️
... and 369 more

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[wesm]

There are multiple JS patches open...what's going to happen when the package.lock files conflict?

[trxcllnt]

Usually they'll merge cleanly, or we can delete and regenerate them (via rm package-lock.json && npm install --package-lock) as part of resolving merge conflicts.

[wesm]

+1. Will merge this and find out what happens...