Advise adding commit hash info in version

[atenjin]

Similar to solc or Substrate, when someone execute --version, would contains the commit hash info:

-->$ solc --version
solc, the solidity compiler commandline interface
Version: 0.8.1+commit.df193b15.Linux.g++

-->$ ./target/debug/polkadot --version
polkadot 1.0.0-2ca35c3-x86_64-linux-gnu

Currently, cargo-contract has not released next version, and we (Redspot) need those features. So we advice to add the commit hash info for our 3rd parites to distinguish whether this cargo-contract is from crates.io or github master. Thanks.

[atenjin]

I have summit pr #189 for this

[cmichi]

Closing the issue now since we have merged the PR a while ago.