[DISCO-4151] Merino: add client for wcs (backport #7345)

[mergify]

This PR adds a new module to the merino crate that calls the Merino /api/v1/wcs endpoint
Also added a suggest subcommand to merino-cli for local testing.

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  • This PR follows the breaking change policy:
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This is an automatic backport of pull request #7345 done by [Mergify](https://mergify.com).

[DonalMe]

I'll review and merge this tomorrow once the AS 152.0 build hits autoland

[DonalMe]

Approved for AS 151.0.1