[version] Display version when booting operator

[surajssd]

Operator shows it's version when it starts. This version information is embedded inside the binary while building it. It is a good practice to show the operator version when it is booting up.

Fixes https://github.com/habitat-sh/habitat-operator/issues/348

[surajssd]

@krnowak I did not understand the part where you are saying

And our release steps will need to be extended with a check for a proper version of the operator.

[krnowak]

I did not understand the part where you are saying

@surajssd: Basically, when doing a release of the operator, we want to make sure that the version it prints is something like v0.7.2, not v0.7.2-31-g9eae1e5d nor v0.7.2-31-g9eae1e5d-dirty nor v0.7.2-dirty.

[surajssd]

@krnowak

And our release steps will need to be extended with a check for a proper version of the operator.

this is done :-)

[krnowak]

LFAD if tests pass.