Use semantic versioning in git tags

[bderrly]

I have recently begun working on a tool which will create HumioRepository custom resources using the kubernetes client. I attempted to import this module go get github.com/humio/humio-operator so that I could import github.com/humio/humio-operator/api/v1alpha1 but the only version that go get will download is the ancient v0.3.0. Using semantic versioning is required for being published by the pkg.go.dev site.

[bderrly]

I believe the best way forward is to have each directory under the api directory be the root of a Go module. This way tagging can be done separately from the root of the repository.

For example, the api/v1alpha1 directory would have a tag like api/v1alpha1/v0.20.3

https://go.dev/ref/mod#vcs-version and https://go.dev/ref/mod#resolve-pkg-mod are useful here.

I can put together a PR to make these changes if there are no disagreements.