add version command to components

[lonelyCZ]

What type of PR is this?
/kind feature

What this PR does / why we need it:

$ ./karmada-scheduler version
karmada-scheduler version: version.Info{GitVersion:"v0.8.0-106-gb2b36a2-dirty", GitCommit:"b2b36a2aaf9038684e96a6c56c1589dbb43bef37", GitTreeState:"dirty", BuildDate:"2021-09-13T03:13:33Z", GoVersion:"go1.16.7", Compiler:"gc", Platform:"linux/amd64"}

$ ./karmada-webhook version
karmada-webhook version: version.Info{GitVersion:"v0.8.0-106-gb2b36a2-dirty", GitCommit:"b2b36a2aaf9038684e96a6c56c1589dbb43bef37", GitTreeState:"dirty", BuildDate:"2021-09-13T03:13:33Z", GoVersion:"go1.16.7", Compiler:"gc", Platform:"linux/amd64"}

$ ./karmada-agent version
karmada-agent version: version.Info{GitVersion:"v0.8.0-106-gb2b36a2-dirty", GitCommit:"b2b36a2aaf9038684e96a6c56c1589dbb43bef37", GitTreeState:"dirty", BuildDate:"2021-09-13T03:13:33Z", GoVersion:"go1.16.7", Compiler:"gc", Platform:"linux/amd64"}

$ ./karmada-scheduler-estimator version
karmada-scheduler-estimator version: version.Info{GitVersion:"v0.8.0-106-gb2b36a2-dirty", GitCommit:"b2b36a2aaf9038684e96a6c56c1589dbb43bef37", GitTreeState:"dirty", BuildDate:"2021-09-13T03:13:33Z", GoVersion:"go1.16.7", Compiler:"gc", Platform:"linux/amd64"}

Which issue(s) this PR fixes:
Fixes #716

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmada-scheduler` introduced a `version` command to represent version information.
`karmada-webhook` introduced a `version` command to represent version information.
`karmada-agent` introduced a `version` command to represent version information.
`karmada-scheduler-estimator` introduced a `version` command to represent version information.

[RainbowMango]

Looks good to me.
But you might need to fix the lint issue.

[lonelyCZ]

Hi, @RainbowMango
the lint issue should be fixed, please review it again.

[RainbowMango]

/lgtm
/approve
Thanks~

[karmada-bot]

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