Basic implementation of the capi-core component

[thobens]

This PR provides the initial implementation of the capi-core component. It utilizes kustomize to build the manifests from the cluster-api and in a post-processing step substitutes variables on the generated output. This simulates the behavior of clusterctl so we can use project syn to set up CAPI.

This component also provides the library libs/capi.libjsonnet for the variable substitution so it can be re-used in other CAPI provider components.

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[github-actions]

🚀 Merging this PR will release v0.0.1

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