patch-console.ts preserves json formatted logs as json format.

[abroom]

Expected Behavior

patch-console.ts adds dd key and value to the log if it is json formatted (and possibly only if log args are length 1 too?).

  dd: {
    trace_id: traceId
    span_id: parentId
  }

Actual Behavior

Converts json object to a string representation and prefixes with [dd.trace_id=${traceId} dd.span_id=${parentId}], resulting in loss of datadog json log functionality.

Steps to Reproduce the Problem

1. Send a json formatted log
2. View the log in datadog and see that it has turned into a string representation in the message and unable to use datadog json parsing features

Workaround

1. Turn off log injection with environmental variable: DD_LOGS_INJECTION: false
2. Import dd-trace from lambda layer
3. Set dd key and value

    const context = tracer.scope().active()?.context();
    const log = {
      dd: {
        trace_id: context?.toTraceId(),
        span_id: context?.toSpanId(),
      },
      // ... other log keys and values
    };