refactor: do full internal refactoring

[mavogel]

This issue was originally opened by @mavogel as https://github.com/hashicorp/terraform-provider-docker/issues/51. It was migrated here as a result of the community provider takeover from @kreuzwerker. The original body of the issue is below.

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Steps

This is an epic captures steps that will be divided up into smaller issues:

• [x] move all flatteners and expanders into the structure_*.go files and test them (due to https://github.com/terraform-providers/terraform-provider-docker/issues/29#issuecomment-400296076) -> #141
• [x] move the state migrators v1-2 into separate files -> #141
• [ ] make all properties consistent and be consistent with API v1.41.1 -> #142
• [x] add doc generation: https://github.com/hashicorp/terraform-plugin-docs and hint to https://registry.terraform.io/tools/doc-preview -> #143
• [x] replace for loops with stateFunc -> #144
• [x] refactor tests (e.g. replace node http servers with more lightweight go ones) and optionally add let's encrypt certificate and remove InsecureRegistries workaround for ACC tests -> #145
• [x] add https://golangci.com/
• [ ] align all *read functions (e.g. until all service attributes are exposed)
• [ ] remove all deprecated attributes
• [ ] move all helper methods to the helpers.go file

Image

• [ ] add check if auth to the registry was successful
• [ ] add check if the image exists in the repository
• [ ] check if tag in internalPullImageOptions is still need with offical docker client
• [ ] fix docker_image import and simplify logic
• [ ] replace latest by sha256_digest / repo_digest
• [ ] add retries to remove or extend context deadline in #206

[github-actions[bot]]

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[Junkern]

This issue is over 2 years old. In addition to that, Hashicorp released a new Terraform provider SDK (called terraform-plugin-framework) which we will eventually migrate to, as it offers some nice features. Will close this.