feat: dashboards + prom operator integration charts

[patrickleet]

This adds two new charts that are based on resources in the istio download.

The first is grafana dashboards, which creates ConfigMaps that are picked up by Grafana (if enabled).

The second is to integrate with prometheus operator by creating Pod and Service monitors. This is just pulled from the addons folder in the istio download.

[jenkins-x-bot]

Hi @patrickleet. Thanks for your PR.

I'm waiting for a jenkins-x-charts or jenkins-x member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jstrachan]

/ok-to-test
/lgtm

[jenkins-x-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jstrachan

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[patrickleet]

/retest

[jenkins-x-bot]

@patrickleet: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pr-build	7a15500	link	/test this

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[patrickleet]

what's the reason for the failure?