Create sub-directories in config for versions

[rmweir]

Some vcluster config logic is version specific. Splitting the config package into version specific sub-directories helps maintain backwards compatibility for package consumers. The subdirectories allow us to use version specific code as needed without carrying it forward to newer versions, creating unnecessary technical debt. Separate go module versions were proposed as an alternative but were rejected in favor of sub-directories for now, as sub-directories are simpler to implement and does not necessitate consumers to import multiple modules.

What issue type does this pull request address? (keep at least one, remove the others) /kind enhancement

What does this pull request do? Which issues does it resolve? (use resolves #<issue_number> if possible) resolves #

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[rmweir]

Moving to different solution: removing config dependence entirely entirely.