feat: add REST sample and test for AML AI

[irataxy]

Description

Fixes b: 355523386

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Checklist

• [X] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [X] Tests pass: go test -v ./.. (see Testing)
• [X] Code formatted: gofmt (see Formatting)
• [X] Vetting pass: go vet (see Formatting)
• [X] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [X] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [X] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

- [amlai/list_locations.go:17](https://github.com/irataxy/golang-samples/blob/6509db513c8e749052696d5e90587059d379e51b/amlai/list_locations.go#L17), tag `antimoneylaunderingai_list_locations`

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[telpirion]

I think we should wait until an official Financial Services Go client is available, rather than shipping a sample with REST.

[telpirion]

Hey @irataxy -- do you still want to add this sample? If not, let's close this PR. Thanks!