Backport of add config read command into release/1.0.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #2078 to be assessed for backporting due to the inclusion of the label backport/1.0.x.

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The person who merged in the original PR is:
@hanshasselberg
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/consul-k8s/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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Changes proposed in this PR:

For CCM Linking existing clusters we were trying to find a good way of retrieving the helm config from consul-k8s, but there was none. Following @lkysow 's suggestion, this PR adds consul-k8s config read command that returns helm configuration.

How I've tested this PR:

How I expect reviewers to test this PR:

Checklist:

• Tests added
• CHANGELOG entry added

  HashiCorp engineers only, community PRs should not add a changelog entry.
  Entries should use present tense (e.g. Add support for...)

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Overview of commits

• 112d1d6 - 413d24b - c7f6c44 - 0aa2024 - 7472313 - 48c09d3 - 370b062

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