Replace folly::Optional with std::optional

[christophpurrer]

Summary:
Using std::optional as react-native has been using C++17 for quite some time

changelog: [Internal]

Differential Revision: D41415031

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D41415031

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,102,660	-873
android	hermes	armeabi-v7a	6,471,373	-484
android	hermes	x86	7,520,833	-335
android	hermes	x86_64	7,379,499	-555
android	jsc	arm64-v8a	8,967,652	-707
android	jsc	armeabi-v7a	7,698,978	-489
android	jsc	x86	9,030,332	-326
android	jsc	x86_64	9,507,964	-726

Base commit: a672869
Branch: main

[analysis-bot]

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

Base commit: a672869
Branch: main

[pull-bot]

PR build artifact for 372f96eb00c0c9ade1405e7a6664b4293715be02 is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[cortinico]

Awesome stuff! I've checked the CMake part and the code looks generally fine to me 👍

[cortinico]

Thanks for fixing this

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D41415031

[pull-bot]

PR build artifact for d79d4359985c4209614cd74b9d2cccfedc03def9 is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D41415031

[pull-bot]

PR build artifact for 0c1ca87 is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[react-native-bot]

This pull request was successfully merged by @christophpurrer in 022e22c.

^{When will my fix make it into a release? | Upcoming Releases}