[feature request] Support for namespace metadata tags

[daktari]

It would be useful to support key/value metadata tags in namespace API definition.

The use case is for example for billing tags or contact information.

nomad namespace inspect team-a
{
    "CreateIndex": 100,
    "Description": "Team A Namespace",
    "ModifyIndex": 22661669,
    "Name": "team-a",
    "Quota": "",
    "Metadata": {
            "owner": "John Doe",
            "contact": "team-a@company.com",
            "billing-ua": "00001"
    }
}

[daktari]

Hi @tgross ,

can you check #12138 ?

Thanks!

[schmichael]

Will ship in Nomad 1.3.0! Thanks for the input everyone!

[github-actions]

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