Align cursor implementation to W3C cursors

[Saadnajmi]

Cherry pick facebook@d3e3e2a and extend the macOS implementation to help make the 0.75 merge easier.

Summary:

Some history:
0ef7992 Added cursor support to React Native macOS initially. facebook@73664f5 upstreamed a subset of that support (auto and pointer) for iOS and visionOS. Then, facebook@d3e3e2a extended the cursor implementation in React Native Fabric to support all the web cursor values (so that out of trees platforms like windows and macOS could implement support). We are one of those out of tree platforms.. so let's implement the new cursor api. Since the cursor creation code is now much more complex, I refactored the paper and fabric implementation to be shared via a new RCTCursor.m file that's an added diff to React Native macOS.

Some notes:

• This is technically a breaking change because we remove support for the cursor disappearing-item that was available from Appkit but not part of the web cursors. Additionally, We add support for vertical-text which is missing from upstream.
• facebook@d3e3e2a only extended the Fabric definition. We support cursors on Paper too, so we'll need to add diffs to port the new values to paper.
• Natively, macOS more or less supports a subset of the web cursors (see NSCursor with some only available as of macOS 15 (currently still in Beta). This means there are some cursor values (ex: all-scroll) we don't support
• Some cursors are only available on macOS 15+ (which requires a minimum of Xcode 16). Some of these new cursors are also replacing now-deprecated cursors. I took extra care to add both a compile time check (to make sure we're backwards compatible with older Xcode versions) and a runtime availability check (to make sure we are backwards compatible with previous macOS versions).

Test Plan:

Updated the test page with all the cursors.

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