✨ Add in memory provider

[fabriziopandini]

What this PR does / why we need it:
Add the in-memory provider to be used for stress testing

NOTE: The code in this PR has been available for feedback at https://github.com/fabriziopandini/cluster-api-provider-goofy for some time now (and this link has been shared during the latest two office hours).

[fabriziopandini]

cc @sbueringer

[killianmuldoon]

Link checker issue is fine as it's just a link to a folder introduced in this PR.

[sbueringer]

As we are publishing this file on our release. let's have a follow-up to add an actual working cluster-template here

[sbueringer]

I wonder if we should do some sort of alpha release to verify this all works

[sbueringer]

As we are publishing this file on our release. let's have a follow-up to add an actual working cluster-template here

Probably makes sense to wait with CC support before we do this (or do it as part of implementing CC support)

[fabriziopandini]

I have added the template I'm using for experimenting with the new provider.
I will open a follow-up issue to improve it

[sbueringer]

I think @ykakarap can update it when he's working on the ClusterClass support (with a template using a CC)

[sbueringer]

/lgtm
/approve

/hold
for squash

Really really great work!!!

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: fb4a5e5a640d7cf4da10141df358d3490317b73b

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[sbueringer]

/hold cancel

[sbueringer]

Merging manually to skip over the link checker

[fabriziopandini]

Note:

• People can still review and we'll open follow-up PRs to address potential findings.
• This work is still at the initial stage - it is just a proof of concept ATM -; so another way to provide feedback is to follow upcoming PRs in this area (I will open issues tracking the next steps and link it here)
• I'm also planning to propose to the community a deep dive session where I can give an overview of the internals of the new provider to everyone interested in it.