[WIP] Get the difference between installed chart and remote chart

[Copilot]

• Analyze existing code structure and understand the issue
• Bootstrap, build and test current functionality
• Understand the pattern used by existing commands (release, revision, rollback)
• Create new values command to compare installed chart values vs remote chart values
• Add command to root.go command structure
• Implement values retrieval for installed chart (using helm get values)
• Implement values retrieval for remote chart (using helm show values)
• Add appropriate flags for chart repository, version, namespace
• Create tests for the new functionality
• Update help text and documentation

Original prompt

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This section details on the original issue you should resolve

<issue_title>Get the difference between installed chart and remote chart</issue_title>
<issue_description>Currently, I'm running the following commands to display the value differences between an installed helm chart version and a newly released version:

# Get installed cilium 1.16.2 helm chart values
$ helm get values cilium -an kube-system | yq -Sy | tail -n +2 > v1.16.2.yaml
# Get remote cilium 1.16.3 helm chart values
$ helm show values cilium/cilium -n kube-system --version 1.16.3 | yq -Sy > v1.16.3.yaml
# Show differences
$ diff -Naur v1.16.2.yaml v1.16.3.yaml

Is there a way to obtain the same result with helm-diff? Thank you.</issue_description>

Comments on the Issue (you are @copilot in this section)

@yxxhero @fmunteanu what's your user case?

Fixes #677

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[yxxhero]

@copilot retry