Support Gateway 2023.3

[code-asher]

Closes #305

This contains the code changes, but looks like we will have to publish a separate version because launchUnderBackgroundProgress, while the usage is the same, fails if you do not update the platform version of the plugin. It had an optional parameter but now uses overloads, and I guess something there is wonky even if the call itself is compatible with both.

[github-actions]

Qodana Community for JVM

55 new problems were found

Inspection name	Severity	Problems
Unused symbol	🔶 Warning	32
Unstable API Usage	🔶 Warning	8
Incorrect string capitalization	🔶 Warning	7
Call to 'equals()' or 'hashCode()' on 'URL' object	🔶 Warning	2
Local 'var' is never modified and can be declared as 'val'	🔶 Warning	1
Redundant semicolon	🔶 Warning	1
Useless call on not-null type	🔶 Warning	1
Class member can have 'private' visibility	◽️ Notice	1
Size check can be replaced with 'isNotEmpty()'	◽️ Notice	1
Trailing comma recommendations	◽️ Notice	1

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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