feat: add ml/base/kmeans/metric-str2enum

[nakul-krishnakumar]

Resolves None.

Description

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This pull request:

• Adds ml/base/kmeans/metric-str2enum.

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@stdlib-js/reviewers

[nakul-krishnakumar]

This PR is blocked by #10714 and in cyclic dependency with #10841

[kgryte]

@nakul-krishnakumar Looks like you'll want to move this package.

[nakul-krishnakumar]

/stdlib merge

[nakul-krishnakumar]

@kgryte I have moved the package, but the test shows error as ml/base/kmeans/metric-enum2str is still not merged. Should I move that package too into this PR (there is a cyclic dependency) or can we just avoid the error and merge it?

[kgryte]

As the CI failure is expected, I'll go ahead and merge.