Harden OpenFin tray menu HTML and message bus sender identity

[bingenito]

Summary

• getMenuItemHtml built the tray context menu's <li> markup by interpolating MenuItem.label/.icon directly into HTML with no escaping, and MenuItem.id directly into an inline onclick JS string with no escaping. A menu item sourced from untrusted content (eg. a remote page's title) could inject markup or break out of the onclick string to run arbitrary script when the tray menu renders. label/icon are now HTML-escaped, and the onclick handler's arguments are built with JSON.stringify and then HTML-attribute-escaped as a whole (JSON.stringify's own double quotes would otherwise collide with the onclick="..." attribute delimiter).
• OpenFinMessageBus.subscribe discarded the sender uuid/name that OpenFin's InterApplicationBus.subscribe callback provides, so listener code had no way to tell who sent a message and authorize accordingly (especially since the default senderUuid is "*"). subscribe now forwards uuid/name to the listener's event object.

[codecov]

Codecov Report

❌ Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.13%. Comparing base (133c5f1) to head (381302a).

Files with missing lines	Patch %	Lines
packages/desktopjs-openfin/src/openfin.ts	81.25%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #871      +/-   ##
==========================================
+ Coverage   74.03%   74.13%   +0.09%     
==========================================
  Files          16       16              
  Lines        1510     1523      +13     
  Branches      318      309       -9     
==========================================
+ Hits         1118     1129      +11     
- Misses        392      394       +2     

Flag	Coverage Δ
unittests	74.13% <81.25%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/desktopjs-openfin/src/openfin.ts	87.78% <81.25%> (-0.11%)	⬇️

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