Add Kotlin script for running benchmarks for all targets (#5566)

The `run_benchmarks.main.kts` script provides running benchmarks on all
supported platforms (macos, desktop, web, ios). It handles
platform-specific details like starting a background server for web
benchmarks or invoking iOS-specific scripts.

Also it handles running benchmarks in a separate process.

`compare_benchmarks.main.kts` and `find_degradations.main.kts` was also
updated to use the script.

Fixes [CMP-8273](https://youtrack.jetbrains.com/issue/CMP-8273)

## Release Notes
N/A