api: enable setting choose parameter

[shoenig]

This is PR 1 of 4 in getting HRW enabled chooseService merged - things are complicated because nomad -depends-on-> consul-template -depends-on-> nomad/api, and nomad{/api} are the same repository 😞

1: changes to nomad/api
2: changes to CT (including nomad/api bump) (hashicorp/consul-template#1579)
3: changes to nomad (including CT bump, so that it includes nomad/api changes) (#12862)
4: bump CT (to point at a tagged version of nomad)

[jrasell]

Do we want this parameter within the QueryOptions when is specific to service registrations or is the idea that I can be used more broadly moving forward? I am comparing it to how we do /v1/nodes?resource=true for example.

[shoenig]

Ahh I see, for a parameter specific to an endpoint we can just use the QueryOptions.Params; I'll do that instead

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