[Enhancement]: Support waiting for codes (Exit and HTTP) using integers besides the existing code matchers

### Proposal

The idea is to add som esugar on top of the existing code matchers:

Instead of this (example using the wait.ForExec strategy):
```golang
WithExitCodeMatcher(func(code int) bool {
	return code == 0
})
```

having this:
```golang
WithExitCode(0)
```

It will internally call the code matcher.