Base libs and apps settings in angular.json

# 🚀 Feature request

### Description
We have many libs and apps in our monorepo. The problem is that most settings for libs in angular.json are identical, same for apps. We have few thousand lines of code in our angular.json, but it could be greatly reduced if we have base settings which can be overrided.

### Describe the solution you'd like
Add base settings for all libs/apps in angular.json which can be overrided by app or lib itself.

Begin with angular.json and compare the repeated settings for libraries and applications. Define how shared base settings should be represented and overridden, then confirm that the configuration remains valid and produces the intended settings for both apps and libraries.

Written by the indexing model from the issue text.