Introduced 'version' command to all relevant binaries

[jstuczyn]

It provides the following build information:

• build timestamp
• binary version
• git commit sha
• git commit timestamp
• git commit branch
• rustc version
• rustc channel (so nightly/beta/stable)
• cargo profile (so debug/release)

Example output:

Build Timestamp:    2021-12-16T10:36:29.427457090+00:00
Build Version:      0.11.0
Commit SHA:         4bb5b9152725ce9fa67ee1802917aafe6920b561
Commit Date:        2021-12-16T10:34:45+00:00
Commit Branch:      feature/version-command
rustc Version:      1.56.1
rustc Channel:      stable
cargo Profile:      debug

It is implemented for:

• mixnode
• gateway
• validator-api
• native client
• socks5 client

[durch]

This is great!