feat: add semver validation to CI

[jackchuma]

Adds semver validation to CI which exposed that a bunch of source code hashes have changed as a result of running the updated foundry formatter. This also required adding go.mod and go.sum to the project root since the tooling for semver validation is written in go

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1