add code-level metric options to nrlambda integration

[rittneje]

Currently the nrlambda integration directly calls StartTransaction and does not pass any TraceOptions.

https://github.com/newrelic/go-agent/blob/5421539b6c7c5d481958236cf247759eff0700ad/v3/integrations/nrlambda/handler.go#L102

I think nrlambda.WrapHandlerand nrlambda.Wrap need to be amended to accept them, just like newrelic.WrapHandle does. Similarly, it should use the file name and line number of the real handler function/method by default.

As part of this, the go.mod file for nrlambda will need to updated with the new minimum version requirement of the "core" agent.