feat: add Substitutions menu roles on macOS

[mitchchn]

Description of Change

Chromium has supported macOS text substitutions for some time now. They already work in Electron, but there was no way to control them from the menubar like in native Mac apps.

This PR exposes the necessary menu roles, and also adds a default Edit > Substitutions menu on macOS.

Fixes #15535.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation is changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Added Substitutions menu roles on macOS: showSubstitutions, toggleSmartQuotes, toggleSmartDashes, toggleTextReplacement.

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[zcbenz]

API LGTM

[miniak]

API LGTM

[codebytere]

API LGTM

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[release-clerk]

Release Notes Persisted

Added Substitutions menu roles on macOS: showSubstitutions, toggleSmartQuotes, toggleSmartDashes, toggleTextReplacement.