Add a callback hook to allow users to configure a base on warmup before running any apt/snap commands

[lengau]

What needs to get done

When creating a base, this should allow a callback hook to be called on warmup immediately after setting up networking, but before doing anything with apt.

Why it needs to get done

This enables configuration of apt (including proxies, etc.) before apt is run.

Amongst other things, this allows the fetch service to intercept the initial apt update.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3461.

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