fix(zone.js): should expose some other internal intefaces

[JiaLiPassion]

PR Checklist

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• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A
zone.js.d.ts now expose __load_patch(name: string, fn: _PatchFn), but _PatchFn is not exposed.

What is the new behavior?

expose _PatchFn , _ZonePrivate and _ZoneFrame interface.

Does this PR introduce a breaking change?

• Yes
• No

[vladimiry]

Thanks for a fast fix.

The error to be fixed (skipLibCheck compilation option is a workaround):

node_modules/zone.js/dist/zone.js.d.ts:292:36 - error TS2304: Cannot find name '_PatchFn'.

292     __load_patch(name: string, fn: _PatchFn): void;

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