Template mixins

[Adirio]

Description

• 76 file templates did not require the domain but it was being injected.
• 66 file templates did not require the repository but it was being injected.
• 72 file templates did not require the multi-group flag but it was being injected.
• 16 file templates did not require the boilerplate but it was being injected.
• 27 file templates required the resource and they were being provided manually.

This PR creates mixins for domain, repository, multi-group, boilerplate and resource as proposed in #1358, that inject those fields from the universe only on those templates that need it.

Motivation

This PR is scoped under #1218
Closes #1358

[k8s-ci-robot]

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[Adirio]

@DirectXMan12 This PR will help with the new file interface that was proposed by #1226 (which is quite outdated). Could you take a look?

Despite saying that it has 43 modified files, most of the logic is in pkg/model/file/template.go.
pkg/model/universe.go updates the interface names in its inject method, pkg/scaffold/api.go and pkg/scaffold/webhook.go stop manually providing the resource, and the other 39 files are just using the mixin in the file templates.

[mengqiy]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Adirio, mengqiy

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