Add the cert-manager CSI driver

[bobdoah]

The cert-manager CSI driver can be used to generate and attach certificates and private keys directly to pods.

What does this PR do?

Add the Cert Manager CSI driver. Closes #950

Motivation

I would like to use this, with Cert Manager as it makes generating and mounting certificates for mTLS very easy.

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs require a new example and/or doc page. In general:

• Use an existing example when possible to demonstrate a new addons usage
• A new docs page under docs/add-ons/* is required for new a new addon

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[askulkarni2]

@bobdoah PR is looking good, minor typos in the doc.

For future, we would love to see an issue first for any significant work - we would hate for your time to be wasted. I've opened #442 for now.

[askulkarni2]

@bobdoah any thoughts on updating the ACM PCA example we have to show the CSI driver in use?

[bobdoah]

@bobdoah any thoughts on updating the ACM PCA example we have to show the CSI driver in use?

@askulkarni2 I updated the eks-cluster-with-new-vpc, but can update that example too, if desired.

[askulkarni2]

LGTM! Thanks for the PR.