add code-level metric options to nrlambda integration

[rittneje]

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

go-agent/v3/integrations/nrlambda/handler.go

Line 102 in 5421539

txn := h.app.StartTransaction(h.functionName)

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.