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.

从 angular.json 开始，比较库和应用中重复的设置。定义应如何表示和覆盖共享的基础设置，然后确认配置仍然有效，并能为应用和库生成预期的设置。

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