🌱 Make in memory runtime and server accessible from outside

[fabriziopandini]

What this PR does / why we need it:
This PR makes public the in-memory runtime package and the in-memory server package so they can be used by other providers as well (we plan to use them in CAPV).

On top of moving those packages out of "internal", the package import alias has been aligned across all the codebase.

/area provider/infrastructure-in-memory

[fabriziopandini]

/test pull-cluster-api-e2e-main-full

To run the test using the in-memory provider

[k8s-ci-robot]

@fabriziopandini: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test pull-cluster-api-build-main
• /test pull-cluster-api-e2e-full-dualstack-and-ipv6-main
• /test pull-cluster-api-e2e-full-main
• /test pull-cluster-api-e2e-main
• /test pull-cluster-api-e2e-mink8s-main
• /test pull-cluster-api-e2e-workload-upgrade-1-29-latest-main
• /test pull-cluster-api-test-main
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The following commands are available to trigger optional jobs:

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Use /test all to run the following jobs that were automatically triggered:

• pull-cluster-api-apidiff-main
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• pull-cluster-api-e2e-main
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In response to this:

/test pull-cluster-api-e2e-main-full

To run the test using the in-memory provider

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[fabriziopandini]

/test pull-cluster-api-e2e-full-main

[fabriziopandini]

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

[chrischdi]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: fc9a4915baee92be9c42549b6a7512f02d2796be

[fabriziopandini]

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

cc @sbueringer

[sbueringer]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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