feat: add property to accessible BrowserWindow window title

[mshoho]

Description of Change

Sometimes it's necessary to convey more information about the window to the screen reader users only (simply putting everything to the window title might be unnecessarily noisy).

For example, Chromium uses that technique to tell the screen reader users that the window is in incognito mode (the incognito window looks differently and doesn't have «incognito» in the title, but for the blind users the screen reader will announce that it's incognito).

Chromium has GetAccessibleWindowTitle() method internally. This PR exposes a way to customize the accessible title via Electron API.

Checklist

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

Release Notes

Notes: Added win.accessibleTitle property to be able to augment the window title for the screen readers.

[welcome]

💖 Thanks for opening this pull request! 💖

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[alexeykuzmin]

@mshoho please use the PR template for description.

[miniak]

approved by mistake, please address those minor issues

[miniak]

please use the correct PR template

[miniak]

@MarshallOfSound can you please review the current version?

[ckerr]

Looks alright. Thanks for the patch!

[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[release-clerk]

Release Notes Persisted

Added win.accessibleTitle property to augment a window title for screen readers.