Cleanup generator-base API.

[mshima]

Overview of the issue

Generator base has too many methods. It should provide only the base methods, technology specific methods like needles and processHtml/Tsx should be removed.

• Implement a new needle base support.
• Migrate needles to this implementation.
• Implement transforms at writeFiles to replace processHtml/processJsx methods.

Motivation for or Use Case

Improve maintainability.

Browsers and Operating System

• [x] Checking this box is mandatory (this is just to show you read everything)

[Tcharl]

For processing and technology specific methods, I encourage to move to a more object-oriented approach with packages and classes located in /utils/<client|server|dcvs|...>/<entity|class>.

[DanielFran]

@mshima Anything missing to close this issue?

[mshima]

We still have the todo generator. https://github.com/jhipster/generator-jhipster/blob/main/generators/base/generator-base-todo.mts

[mshima]

@DanielFran bounty claimed https://opencollective.com/generator-jhipster/expenses/187981

[DanielFran]

@mshima approved