Add line offset for baseline alignment of text attachments

[j-piasecki]

Summary:

In #45102 I've implemented a baseline alignment function for the new architecture. I've noticed one thing I've missed previously - locationForGlyphAtIndex is relative to the line fragment, not the container. This means that the attachments would be put in the wrong place in multiline text.

This PR fixes that by adding the position of the entire line to the attachment position.

Changelog:

[IOS] [FIXED] - Fixed baseline attachment position in multiline text

Test Plan:

Checked on relevant example of RNTester.

Before	After

[cipolleschi]

great job! Although I can't see the differences between before and after, but that's me! 😅

[facebook-github-bot]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cipolleschi merged this pull request in 9bfbf94.

[react-native-bot]

This pull request was successfully merged by @j-piasecki in 9bfbf94

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