Pluto settings models

[cbgbt]

Issue number:
bottlerocket-os/bottlerocket#4135

Description of changes:
Pluto requests an initial set of settings from the Bottlerocket API as dependencies needed to generate additional kubernetes settings.

There was a bug in pluto in which no-proxy settings were attempted to be deserialized into a String when the value in the model is stored as a Vec. This updates pluto to use the settings models from the settings SDK to deserialize the settings returned from the API.

Testing done:

• unit tests pass
• test with proxy enabled
• test cluster dns IP properly set in a cluster
• test max pods properly set
• test provider_id properly set
• test node_name properly set

I enabled https-proxy pointing to a tinyproxy that I configured, then tested instance startup with various no-proxy settings:

• Unset no-proxy: Noted traffic in my proxy logs and also that the Cloudtrail noted the IP address of my proxy as the source for EKS DescribeCluster traffic
• no-proxy: ["*"] bypassed the proxy when communicating with the EKS API
• No proxy settings: all EKS settings still set as usual

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.

[cbgbt]

^ Force push minor readability fix.

[bcressey]

nit: maybe this? read sounds like it will read all settings, and someone not using the macros might call it by mistake:

Suggested change

	pub fn read(&self) -> &SettingsView {
	&self.readonly
	}
	pub fn initial(&self) -> &SettingsView {
	&self.initial
	}

[cbgbt]

Sorry for churn. Forgot to push after rebasing to make the inter-diffs cleaner.

^ Rebases onto develop

[cbgbt]

^ updated to include metadata for new settings models release.