feat: vendor infrastructure provider APIs

[dkoshkin]

@jimmidyson and I were briefly talking about this idea. Here is an attempt of using infra provider types that are synced from upstream repos. It is easier to work with Go types instead of unstructured.
Switched the AWS region handler to use these new types to show that it works.

An important part of this PR is the automated syncing. I added it as makefile targets to keep it simple, but can be extended if no longer enough as we add additional providers.

[dkoshkin]

aec5363 here is a fun idea @faiq and I saw in some CAPI provider (don't remember which one), using a separate go.mod for each provider. This has the benefit of using dependabot to keep the version updated.

If we don't want this, we should still bring in the directory change from that commit, I think placing it in the more explicit dir is nicer common/pkg/external/sigs.k8s.io/cluster-api-provider-aws/v2/api/v1beta2/.

[jimmidyson]

I love this! I've taken the liberty of making a few changes (all can be reverted if you disagree with what I've done btw):

• Use go mod cache paths instead of vendoring

• Moving stuff around a bit (not the final API destination btw): moved placeholder modues into hack/third-party for what feels like a "cleaner", never-import-this, kinda place.

• Added CAPD to show how we can extend this for other providers nice and easily

• Fixed up build stuff, golangci-lint ignoring, etc and added pre-commit hook to ensure it is kept up to date