Remove Picker from OSS

[lunaleaps]

Summary: Changelog:[General][Removed] - Remove Picker iOS code

Reviewed By: p-sun

Differential Revision: D29124724

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D29124724

[pull-bot]

	Messages
📖	📋 Missing Changelog - Can you add a Changelog? To do so, add a "## Changelog" section to your PR description. A changelog entry has the following format: [CATEGORY] [TYPE] - Message. Details CATEGORY may be: General iOS Android JavaScript Internal (for changes that do not need to be called out in the release notes) TYPE may be: Added, for new features. Changed, for changes in existing functionality. Deprecated, for soon-to-be removed features. Removed, for now removed features. Fixed, for any bug fixes. Security, in case of vulnerabilities. MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.
📖	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.
📖	📋 Missing Summary - Can you add a Summary? To do so, add a "## Summary" section to your PR description. This is a good place to explain the motivation for making this change.

Generated by 🚫 dangerJS against dc77e45

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 4ad4426

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	9,120,154	+0
android	hermes	armeabi-v7a	8,646,057	+0
android	hermes	x86	9,559,354	+0
android	hermes	x86_64	9,525,521	+0
android	jsc	arm64-v8a	10,762,858	+0
android	jsc	armeabi-v7a	9,680,015	+0
android	jsc	x86	10,797,462	+0
android	jsc	x86_64	11,405,123	+0

Base commit: 4ad4426

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D29124724

[facebook-github-bot]

This pull request has been merged in cddb97a.