add fromModel helper

[stevendborrelli]

Description of your changes

Add a fromModel helper to clean up the fromJson/toJson pattern that emerges from using models:

Before:

dcds["my-pod"] = Resource.fromJSON({
     resource: pod.toJSON()
});

after:

dcds["my-pod"] = fromModel(pod);

Fixes #

I have:

• Read and followed Crossplane's contribution process.
• Added or updated unit tests for my change.

[Copilot]

Pull request overview

Adds a fromModel helper to reduce boilerplate when converting Kubernetes model objects (e.g., kubernetes-models) into Resource protobuf wrappers.

Changes:

• Introduces fromModel() helper that accepts either a model with toJSON() or a plain object and returns a Resource.
• Adds Vitest coverage for fromModel, plus existing fromObject / toObject behaviors.
• Updates public exports and README usage example to recommend fromModel.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
src/resource/resource.ts	Adds fromModel helper and reformats a few existing utilities
src/resource/resource.test.ts	Adds unit tests for fromModel, fromObject, and toObject
src/index.ts	Re-exports fromModel from the package entrypoint
README.md	Documents the simplified usage via fromModel

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