Add hosts endpoint to get a host list

[dongothing-dd]

Is your feature request related to a problem? Please describe.
No. I can curl the endpoint, but this should be easier.

Describe the solution you'd like
Add a hosts mode and a list verb with available filters.

Describe alternatives you've considered
Curl works fine as shown in our docs: https://docs.datadoghq.com/api/latest/hosts/#get-all-hosts-for-your-organization

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