feat: add build time version for Database Lab server and CLI (#79)

Description

Add build time version for Database Lab server and CLI

Related issue

#79 (closed)

Examples

$ dblab-server
2020/08/21 13:34:25 [INFO]   Database Lab version:  2.0.0-beta.1-20200821-0634
...

$ dblab --version
dblab version 2.0.0-beta.1-20200821-0628

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes

Closes #79 (closed)