Added debug trace with DSC version

[anmenaga]

PR Summary

2 updates with this PR:

1. Changed Clap::Args::version (used in dsc -V) to use value from dsc\Cargo.toml. This makes one less place to update when dsc version is incremented after a release.
2. Added debug statement with the current dsc version; e.g.:

PS C:\DSCv3> dsc -l trace resource get -r Microsoft/OSInfo
  2023-11-01T22:59:24.235180Z DEBUG dsc: Running dsc 3.0.0-alpha.4
    at src\main.rs:48

[SteveL-MSFT]

For debug it may make sense to include basic OS info: windows, linux, mac version and architecture, but that can be a different PR. This way when people open bugs, we can just have them copy the output to the issue.