Add new "common" schematic to share configurations for all schematics at once

### Command

generate

### Description

Implement an internal artifact to commonize the configuration of schematics so that all schematics can share a common configuration by default, and override on a per-artifact basis if needed. Currently, all configurations are duplicated, and while not that annoying to deal with for a single collection, it can quickly add up when using several collections.

### Describe the solution you'd like

Actual :
```json
{
"schematics": {
"@schematics/angular:component": { "skipSelector": true },
"@schematics/angular:directive": { "skipSelector": true },
"@schematics/angular:pipe": { "skipSelector": true }
}
}
```
Proposed :
```json
{
"schematics": {
"@schematics/angular:common": { "skipSelector": true }
}
}
```

This new `common` schematic would contain either
- only fields that are common to all artifacts
- All fields possible, even if not applicable to certain artifacts

Resolving would follow this pattern :
- Look for common artifact schematic value
- If existing, apply value
- If all fields are possible : also check if value is applicable to artifact
- Look for direct artifact schematic value
- Override value

### Describe alternatives you've considered

Doing it by hand as already done today is the only solution

从 generate 命令和 schematic 配置解析路径开始。将提议的通用配置与当前的按 artifact 配置进行比较，然后定义通用值的应用方式，以及 artifact 直接指定的值如何覆盖通用值。当 schematics 可以继承共享的默认值，同时保留按 artifact 的覆盖时，即视为完成。

由索引模型根据 Issue 内容生成。