Please hardcode version numbers instead of relying on ldflags

[agowa]

Hi,

please reconsider the reliance on ldflags for provide a simple way to indentify the deployed version of vsphere-csi.

vsphere-csi-driver/pkg/csi/service/identity.go

Line 26 in af2df0c

// Version of the driver. This should be set via ldflags.

Currently a lot of deployments ship vsphere-csi-driver in a state that it just outputs a blank line. This makes it unnecessarily difficult to identify its version number.