initial commit for terminating gateway service

[Oluwalogoye]

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Changes proposed in this PR:

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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