Version tag on .ergo files

[kach]

At some point it might be prudent for everyone to start putting a comment on top of Ergo files saying which version of Ergo they compiled their code with — since Ergo is changing, we might eventually have bugs caused by incompatibilities and the version comment would help sort that out.

[kach]

Syntax proposal: ergo version "1.2.3"

Semantics proposal: if the version provided is a prefix of ergo_version then continue without saying anything. Otherwise, print a warning and then continue.

[mttrbrts]

Cicero uses https://semver.org, we should align with that too if we can.

[Shivansh2407]

Please explain what to do?
Also please assign this issue to me .