Feat: modular and scalable refactor, --template flag and react template support

[maverox]

What kind of change does this PR introduce?

• made major refactor by breaking plopfile containing generator and actions into individual generators and actions in a separate file to improve readability, extensibility and modularity
• added --template flag and logic to get corresponding default answer and generator function
• added prompt for valid template on entering an invalid one
• added react templates
• added react generator logic

Did you add tests for your changes? yes If relevant, did you update the documentation? yes Summary refactored core, introduced template flag and react template support

Does this PR introduce a breaking change?

Other information

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.52%. Comparing base (31f634a) to head (4bd0950). Report is 64 commits behind head on master.

:exclamation: There is a different number of reports uploaded between BASE (31f634a) and HEAD (4bd0950). Click for more details.

HEAD has 36 uploads less than BASE

| Flag | BASE (31f634a) | HEAD (4bd0950) | |------|------|------| ||40|4|

Additional details and impacted files

[](https://app.codecov.io/gh/webpack/webpack-cli/pull/4211?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack) ```diff @@ Coverage Diff @@ ## master #4211 +/- ## =========================================== - Coverage 90.18% 68.52% -21.67% =========================================== Files 22 9 -13 Lines 1702 1366 -336 Branches 491 427 -64 =========================================== - Hits 1535 936 -599 - Misses 167 430 +263 ``` [see 18 files with indirect coverage changes](https://app.codecov.io/gh/webpack/webpack-cli/pull/4211/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/webpack/webpack-cli/pull/4211?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/webpack/webpack-cli/pull/4211?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack). Last update [cd1099a...4bd0950](https://app.codecov.io/gh/webpack/webpack-cli/pull/4211?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webpack).