chore: add script to pull commits to cherrypick

[andrewseguin]

Example output:

^_^ node scripts/caretaking/cherrypick-patch.js 2019-07-20
Loading 11 pull requests
Loading PR #16604
Loading PR #16593
Loading PR #16587
Loading PR #16574
Loading PR #16571
Loading PR #16561
Loading PR #16556
Loading PR #16545
Loading PR #16466
Loading PR #16091
Loading PR #16057

16561	2019-07-22T18:41:02Z	701302dc482d7e4b77990b24e3b5ab330bbf1aa5	https://github.com/angular/components/pull/16561	style(mdc chips) Fix clashing input and remove classes
16604	2019-07-24T23:52:23Z	b5b9ff726e984b1ba31febea30b5afa3153ebbeb	https://github.com/angular/components/pull/16604	fix(popover-edit): blending in with background in high contrast mode
16593	2019-07-24T23:54:28Z	583af19e9cc6fb37e1e4d32fe2abcf9700d12fff	https://github.com/angular/components/pull/16593	feat(material-experimental): add test harness for radio-button
16571	2019-07-24T23:54:59Z	b0991de9284f5f24f708dcd92dca034623cf7595	https://github.com/angular/components/pull/16571	docs(expansion): fix docs for togglePosition input
16057	2019-07-24T23:58:40Z	13becdab50b6b9cf979ef9b3745f4fa29ff750c7	https://github.com/angular/components/pull/16057	fix(popover-edit): incorrectly caching values for more than one control
16091	2019-07-24T23:59:18Z	174bf4076a5c0a97d922741230c5e8143c0dc84f	https://github.com/angular/components/pull/16091	fix(popover-edit): focus trap not being destroyed and potential leaks with takeUntil
16587	2019-07-25T00:03:46Z	bd24369d3883cee834662800b0a5b043ffdc1c6c	https://github.com/angular/components/pull/16587	fix(button-toggle): error when checked value is set via static attribute in Ivy
16574	2019-07-25T00:04:38Z	67532dbbb8a14dfdca2134b506b6269d76700516	https://github.com/angular/components/pull/16574	fix(mdc chips) Fix matChipRemove Expression has changed error
16466	2019-07-25T18:39:31Z	615070acbdb2962eca3bebadb19720c614848981	https://github.com/angular/components/pull/16466	fix(popover-edit): unable to close by pressing enter on some screen readers
16545	2019-07-25T20:14:19Z	2a04ccfd46c154cc5a23993cda8dff3474f2248c	https://github.com/angular/components/pull/16545	feat(material-experimental): add test harnesses for slide-toggle
16556	2019-07-26T15:56:47Z	88631b936d371b6157cb686a88b2fef35c30dc0b	https://github.com/angular/components/pull/16556	feat(material-experimental): add test harness for button
---------------
--Cherry-pick--
---------------

git cherry-pick 701302dc482d7e4b77990b24e3b5ab330bbf1aa5;
git cherry-pick b5b9ff726e984b1ba31febea30b5afa3153ebbeb;
git cherry-pick 583af19e9cc6fb37e1e4d32fe2abcf9700d12fff;
git cherry-pick b0991de9284f5f24f708dcd92dca034623cf7595;
git cherry-pick 13becdab50b6b9cf979ef9b3745f4fa29ff750c7;

git cherry-pick 174bf4076a5c0a97d922741230c5e8143c0dc84f;
git cherry-pick bd24369d3883cee834662800b0a5b043ffdc1c6c;
git cherry-pick 67532dbbb8a14dfdca2134b506b6269d76700516;
git cherry-pick 615070acbdb2962eca3bebadb19720c614848981;
git cherry-pick 2a04ccfd46c154cc5a23993cda8dff3474f2248c;

git cherry-pick 88631b936d371b6157cb686a88b2fef35c30dc0b;

[mmalerba]

cool stuff!

[andrewseguin]

• Moved the script to tools and changed it to be Typescript
• Added command from package.json: yarn cherry-pick-patch
• Attempts to automatically default to the latest patch branch, prompts user to confirm
• Uses the patch branch's commit messages to find the latest SHA to cherry-pick
• Confirms with user if the commit is correct

TODO's left for another PR:

• Handle pagination for cases were there are over 100 commits to cherry-pick (thanks Paul)
• Use a local environment variable for authentication token (thanks Miles)

[jelbourn]

LGTM

[jelbourn]

Lint error

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