feat(extensions): add `forge run` command

### Component

Forge

### Describe the feature you would like

Add `forge run`, similar to how a Hardhat project can have scripts in `package.json` and be run with `npm run script`.

```
[profile.default]
src = "src"
out = "out"
libs = ["lib"]

[actions]
build = "bash actions/build.sh"
```

This would enable pre-compilation hooks, and other workflows.

### Additional context

_No response_

No files or tests are named. Start by tracing existing Forge CLI commands and configuration handling, then compare how command actions are defined and invoked. Done means a documented `forge run` workflow supports the proposed `[actions]` configuration and the stated pre-compilation and project-script use cases.

Written by the indexing model from the issue text.