feat：TemplateAPI 和 GeneratorAPI 整合，抽象为一个父类

[yhstsy]

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows our guidelines: https://github.com/xun082/create-neat/blob/master/CONTRIBUTING.md
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ √ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

• Closes https://github.com/xun082/create-neat/issues/149
• Related to https://github.com/xun082/create-neat/issues/24

What is the new behavior?

TemplateAPI 和 GeneratorAPI 整合，抽象为一个父类

Does this PR introduce a breaking change?

[ ] Yes
[ √] No

Other information

[uaenaTzx]

同时还要注意两个点

1. 做完之后，需要测试一波（dev、prod 两个环境）
2. 给框架（test 那个包）加上 generator 测试 extendPka 的效果