machine: Add provider detection API

[jakecorrenti]

Extends the pkg/machine/provider package to add an API which includes provider detection based on the host operating system.

Does this PR introduce a user-facing change?

None

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Ephemeral COPR build failed. @containers/packit-build please check.

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Ephemeral COPR build failed. @containers/packit-build please check.

[mheon]

Code LGTM

[baude]

im going to merge but @jakecorrenti , perhaps you can consider a semver update

[baude]

/lgtm

[cfergeau]

Regarding macos version checks, you could also add a check to the installer, something like https://github.com/cfergeau/podman/commit/f5c5f4a5e368243417773b56889b2627802eac01 which I haven't tested.