[FL-3925, FL-3942, FL-3944] JS features & bugfixes (SDK 0.2)

[portasynthinca3]

What's new

• Glue module for the widget GUI view. FL-3925
• GPIO PWM support. Support PWM output in JavaScript GPIO module #4035, FL-3942
• The event loop module stops upon request (back key)
• The event loop module stops upon error, allowing them to be reported. JavaScript errors in eventLoop.subscribe are not displayed #4071, FL-3944

Verification

• widget view: run the gui.js demo script, menu entry "Widget"
• GPIO PWM & stop: run the gpio.js demo script and verify that PA7 outputs a PWM signal. Press the back key, verify that the script is interrupted.
• Error reporting: write and run a script that invokes some kind of error in an event loop callback. Verify that the script stops and that the error is reported.

Remarks

As per usual, I will upload the new version of the SDK package if/when this PR is merged.

Checklist (For Reviewer)

• PR has description of feature/bug or link to Confluence/Jira task
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[github-actions]

Compiled f7 firmware for commit b2290e7e:

• 📦 Update package
• 📥 DFU file
• ☁️ Web/App updater
• 📊 Size report

[portasynthinca3]

Published the new package version.