Move SSH SDK creation wizard to remote-run module and move general SDK creation to platform-impl module

Extract showProcessExecutionErrorDialog() method to the separate PyProcessExecutionErrorDialog.kt file

There should be only one way to start process using `PyRemoteProcessStarterManager`. Anything else must be implemented as EP.

`PyRemotePackageManagerImpl` moved from `intellij.python.community.impl` to `intellij.python.remoteInterpreter` module.

This reverts commit b3e9ce44

IDEA-CR-37138

* Don't use `CFRetain`/`CFRelease` for activity token, since it's not guaranteed to be a `CFObject`

This fixes signing error (IDEA-199142).

avoid instantiating Visitor several times; avoid child.accept(new Visitor()) pattern (for  IDEA-CR-37113)