WIP: Proposal for dedicated hosts

[faermanj]

/kind documentation

What this PR does / why we need it:

Adds the proposal for supporting EC2 Dedicated Hosts

Checklist:

• squashed commits
• includes documentation

Release note:
NONE

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[mtulio]

Is there any risk of control planes "losing" HW HA when allocating control planes in the same host, or will the proposal covers only the EC2 instances for worker/compute nodes?

[nrb]

Would it be reasonable to require a minimum of 3 dedicated hosts?

[damdo]

Hey @faermanj thanks for opening this proposal.
On a first pass I think it sounds reasonable to me. I left a question.

[damdo]

Where is this available in the instance object exposed by the AWS client?

[damdo]

/assign @kubernetes-sigs/cluster-api-provider-aws-maintainers

[damdo]

/cc. @nrb

[nrb]

I haven't forgotten about this, but have been focusing on investigating CI failures the last couple weeks.