[refactoring] reduce size of execute rewrite recipes messages

[martinlippert]

The message for the command sts/rewrite/execute contains lots of data and has a size of about 500Kb (in my tests). This doesn't seem to be reasonable and we should reduce the size down to the data that is really needed to identify the selected recipes and their params (as a first guess).

[BoykoAlex]

The sts/rewrite/list needs improvements in this area as well. Likely we need to flatten the recipe tree such that when navigating inside the recipe we'd load more data for sub-recipes rather than load everything at once.
There is going to be quite a bit of work. Size of the recipe descriptor json has grown thus we'd need to address this rather soon.