Add support for Electron versions from 15 to 17

[GytisCepk]

Changes

• Changed "electron" peer dependency version from ^14.0.0 to >=14.0.0 <18.0.0 in @itwin/core-backend and @itwin/certa packages. This allows users to choose between several major Electron versions.
• Increased "electron" dev dependency to ^17.0.0 to use latest supported electron version in development.

Considerations in supporting multiple major versions of Electron

Electron breaking changes

Electron breaking changes list. From what I can tell non of the breaking changes on the list break our API or behavior.

Node versions

Electron supported Node versions per Electron version:

Electron version	Node version
14.0.0	14.17
15.0.0	16.5
16.0.0	16.9
17.0.0	16.13

Since we support >=14.17 and >=16.13 Node versions, this should be fine (unless Electron requires exact Node version ?).

Testing

Changes were tested with Electron versions 14.2.9, 15.5.7 and 17.4.11. full-stack-test tests with electron as a dependency pass and appui, display and ui test apps seem to work as intended.

[GytisCepk]

This PR looks good to me. Any reason it's still sitting in a draft state?

There is a problem with Certa tool not working properly while debugging on Electron 19. Working on that right now.

[GytisCepk]

@calebmshafer, @aruniverse

Support for Electron 18 and 19 is still blocked by AsyncLocalStorage problem. It seems to be a V8 bug (Issue #35043). My recommendation is to add support for Electron versions 15, 16 and 17 for now. Once the V8 fix is available, we should revisit Electron support once again.

[calebmshafer]

@calebmshafer, @aruniverse

Support for Electron 18 and 19 is still blocked by AsyncLocalStorage problem. It seems to be a V8 bug (Issue #35043). My recommendation is to add support for Electron versions 15, 16 and 17 for now. Once the V8 fix is available, we should revisit Electron support once again.

@GytisCepk That sounds good for now. Can you add a note in the NextVersion.md to explain it?

[pmconne]

Taking display-test-app for a spin (node 16.16.0, Ubuntu 20.04).

[pmconne]

I am enqueuing an ImageTests run against this branch. Please do not complete this PR until the results are analyzed.

[pmconne]

display-test-app appears to be working normally and ImageTests reports no problems.

[pmconne]

@calebmshafer @wgoehrig this is awaiting your review.