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

generate コマンドと schematic の設定解決パスから始めます。提案されている共通設定と現在のアーティファクトごとの設定を比較し、共通の値をどのように適用するか、またアーティファクトに直接指定された値でどのように上書きするかを定義します。schematics が共有されたデフォルト値を継承しつつ、アーティファクトごとの上書きを維持できれば完了です。

索引モデルが issue の本文から書いたものです。