ytt execution can be interrupted (via a Go Context)

**Describe the problem/challenge you have**

We would like to use the ytt Go module but we'd like to protect against bad templates that may take down the system (e.g. a template that defines an infinite loop). If we shell out to the executable, we can pass a context with a timeout to protect against this. With the go module, though, there is no way to pass such a context.

**Describe the solution you'd like**

Allow the ytt Go module to accept a context so we can get a timeout.

**Additional Information**

Related Slack conversation: https://kubernetes.slack.com/archives/CH8KCCKA5/p1642715223106300

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