Add a filter on recommendation

[benjlevesque]

As suggested in #321, this PR adds a filter to hide containers that matches the VPA recommendation.

The proposed filters are:

• all: current behaviour
• any: show containers that don't meet recommendations
• guaranteed: show containers that don't meet guaranteed recommendations
• burstable: show containers that don't meet burstable recommendations

UI:

As I am a new user of goldilocks, let me know if those filters are not the correct ones.

[sudermanjr]

First glance this looks really great. Thanks for the contribution!

I'll try to give it a more thorough review this week.

[sudermanjr]

I think there might be an issue with the filter logic. Just testing functionally, I get this

▶ ./goldilocks summary --filter any | jq .
{
  "Namespaces": {
    "default": {
      "namespace": "default",
      "deployments": {}
    }
  },
  "Filter": "any"
}

▶ ./goldilocks summary --filter burstable | jq .
{
  "Namespaces": {
    "default": {
      "namespace": "default",
      "deployments": {}
    }
  },
  "Filter": "burstable"
}

▶ ./goldilocks summary --filter guaranteed | jq .
{
  "Namespaces": {
    "default": {
      "namespace": "default",
      "deployments": {
        "demo-basic-demo": {
          "deploymentName": "demo-basic-demo",
          "containers": {
            "basic-demo": {
              "containerName": "basic-demo",
              "lowerBound": {
                "cpu": "15m",

(output was shortened)

TL;DR - I see recommendations for guaranteed, but not any. I had thought that "any" should include the "guaranteed", but maybe I'm off here?

[sudermanjr]

Also, please see my previous comment regarding the filter logic.

I have additional concerns about the implementation of the UI, but it's going to take me a bit to compile them

[sudermanjr]

The aria-hidden will make this check invisible to screen readers.

Suggested change

	<i aria-hidden="true" class="fas fa-fw fa-check"></i>
	<i class="fas fa-fw fa-check"></i>