Add ability to get ShadowNodeFamily's ancestors as shared pointers

[vincentriemer]

Summary: Changelog: [Internal] - Add ability to get ShadowNodeFamily's ancestors as shared pointers

While working on the hover tracking logic I've found the need to recieve a node's ancestor list to contain shared pointers to ShadowNodes instead of references to them. This isn't necessarily to get ownership of the ancestors but instead will allow me to store those shadow node lists as weak pointers so I have a mechanism to know when they've been deallocated.

RFC: This effectively just adds a copy of the existing getAncestors method with minor changes. This creates some code duplication but I'm unsure of a more elegant way to do this so I'm open to ideas.

Differential Revision: D48170045

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D48170045

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,956,135	+7,226
android	hermes	armeabi-v7a	n/a	--
android	hermes	x86	n/a	--
android	hermes	x86_64	n/a	--
android	jsc	arm64-v8a	9,549,485	+7,236
android	jsc	armeabi-v7a	n/a	--
android	jsc	x86	n/a	--
android	jsc	x86_64	n/a	--

Base commit: 910a9567f42f65971c480eac7c8eb65a56c14361 Branch: main

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D48170045

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