✨ Add vcsim server provider

[fabriziopandini]

What this PR does / why we need it:
This PR adds a vcsim server that can be used in tilt for:

• Testing CAPV in legacy mode, using vcsim instead of a real vCenter
• Testing CAPV in supervisor mode, using vcsim instead of a real vCenter

The second option also provides some of the building blocks for implementing E2E for CAPV in supervisor mode on VMC (or on any vSphere), but some work is still necessary to make this possible

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (b230286) 64.94% compared to head (8245cd0) 64.19%.
Report is 54 commits behind head on main.

Files	Patch %	Lines
pkg/util/supervisor.go	0.00%	17 Missing ⚠️
internal/test/helpers/vcsim/builder.go	15.38%	9 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2613      +/-   ##
==========================================
- Coverage   64.94%   64.19%   -0.75%     
==========================================
  Files         118      118              
  Lines        8580     8620      +40     
==========================================
- Hits         5572     5534      -38     
- Misses       2582     2647      +65     
- Partials      426      439      +13     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[fabriziopandini]

/hold
It seems there is ongoing work in vcsim that could help us here, I'm gathering info

[sbueringer]

@fabriziopandini IIRC you wanted to make some further changes before review, correct?

[fabriziopandini]

/hold cancel
the ongoing work in vcsim will make it easier some parts of the CAPV testing effort, but we still need this work if we want to keep the simulated environment as lightweight as possible (e.g. don't use a container for each VM)

[fabriziopandini]

@sbueringer this one should be ready for review now

[sbueringer]

/retest

[sbueringer]

/test pull-cluster-api-provider-vsphere-e2e-main

(to run all tests)

[sbueringer]

I changed my mind and added comments instead of opening a PR (A large percentag of my points are questions)

[sbueringer]

/retest

[sbueringer]

Last one from my side

[sbueringer]

Thank you very much.

Really nice work :)

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 384539b0d244b9575d0abb922aacac95a290d605

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [sbueringer]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment