1.6.10-dev1580

Option to pack jars as uber JAR, support Proguard for uber JAR (#4136)

## Proposed changes
1. Added support to join JARs to the uber JAR with ProGuard, disabled by
default:
```
compose.desktop {
    application {
        buildTypes.release.proguard {
            joinOutputJars.set(true)
        }
    }
}
```
2. All 'release' tasks now really depend on ProGuard, as stated in
[tutorial](https://github.com/JetBrains/compose-multiplatform/tree/master/tutorials/Native_distributions_and_local_execution#minification--obfuscation).

## Testing
- A new auto test

- Manual:
1. Test on Windows/macOs/Linux
2. Test the new Gradle parameter `joinOutputJars`:
```
compose.desktop {
    application {
        buildTypes.release.proguard {
            joinOutputJars.set(true)
        }
    }
}
```
`false` (by default) should generate multiple jars (except for
`package*UberJarForCurrentOS`)
`true` should generate a single jar in a result distribution
3. Test debug tasks:
```
run
runDistributable
createDistributable
packageUberJarForCurrentOS
```
4. Test release tasks:
```
runRelease
runReleaseDistributable
createReleaseDistributable
packageReleaseUberJarForCurrentOS
```
The jars should be reduced in size (because Proguard is enabled in the
release mode)

This should be test by QA.

## Issues fixed
Fixes https://github.com/JetBrains/compose-multiplatform/issues/4129

---------

Co-authored-by: Igor Demin <[email protected]>