[BUG] OTEL - Activity Tag: Array is not supported

Describe the bug
In my application, if I set a tag with a array of int as value, the data-prepper is unable to process the ressourcespan.

To Reproduce
Steps to reproduce the behavior:
In a c# .net core console, add OpenTelemetry package and opentelemetry.exporter.opentelemetryprotocol

Add :

                var MyActivitySource = new ActivitySource(serviceName);

                using var activity = MyActivitySource.StartActivity("SayHello");
                activity?.SetTag("baz", new int[] { 1, 2, 3 });

Setup the OtelCollector to send data to the Data-prepper:
Config:

receivers:
  otlp:
    protocols:
      grpc:
        #endpoint: 0.0.0.0:55680

exporters:
  otlp/2:
    endpoint: localhost:21890
    tls:
      insecure: true
      insecure_skip_verify: true
  logging:

service:
  pipelines:
    traces:
      receivers: [otlp]
      exporters: [logging, otlp/2]

when the trace reach the server, it can't be consumed as the "bar" attributes is set multiples times (Array data).

Expected behavior
No errors.

Error Logs

2022-04-11T15:20:06,952 [raw-pipeline-processor-worker-5-thread-1] ERROR com.amazon.dataprepper.plugins.prepper.oteltrace.OTelTraceRawPrepper - Unable to process invalid ResourceSpan resource {
data-prepper              |   attributes {
data-prepper              |     key: "service.name"
data-prepper              |     value {
data-prepper              |       string_value: "MDS.TestSerilog.Test"
data-prepper              |     }
data-prepper              |   }
data-prepper              |   attributes {
data-prepper              |     key: "service.version"
data-prepper              |     value {
data-prepper              |       string_value: "1.0.0"
data-prepper              |     }
data-prepper              |   }
data-prepper              |   attributes {
data-prepper              |     key: "service.instance.id"
data-prepper              |     value {
data-prepper              |       string_value: "be537731-e6c8-48b8-8202-2d50301b61c9"
data-prepper              |     }
data-prepper              |   }
data-prepper              | }
data-prepper              | instrumentation_library_spans {
data-prepper              |   instrumentation_library {
data-prepper              |     name: "MDS.TestSerilog.Test"
data-prepper              |   }
data-prepper              |   spans {
data-prepper              |     trace_id: "\355\273\256\213\nc9D\253\211\324\240lD\220s"
data-prepper              |     span_id: "\307) R\276\247\244A"
data-prepper              |     name: "SayHello"
data-prepper              |     kind: SPAN_KIND_INTERNAL
data-prepper              |     start_time_unix_nano: 1649690403941588600
data-prepper              |     end_time_unix_nano: 1649690403942298100
data-prepper              |     attributes {
data-prepper              |       key: "foo"
data-prepper              |       value {
data-prepper              |         int_value: 1
data-prepper              |       }
data-prepper              |     }
data-prepper              |     attributes {
data-prepper              |       key: "bar"
data-prepper              |       value {
data-prepper              |         string_value: "Hello, World32!"
data-prepper              |       }
data-prepper              |     }
data-prepper              |     attributes {
data-prepper              |       key: "baz"
data-prepper              |       value {
data-prepper              |         int_value: 1
data-prepper              |       }
data-prepper              |     }
data-prepper              |     attributes {
data-prepper              |       key: "baz"
data-prepper              |       value {
data-prepper              |         int_value: 2
data-prepper              |       }
data-prepper              |     }
data-prepper              |     attributes {
data-prepper              |       key: "baz"
data-prepper              |       value {
data-prepper              |         int_value: 3
data-prepper              |       }
data-prepper              |     }
data-prepper              |     status {
data-prepper              |     }
data-prepper              |   }
data-prepper              | }
data-prepper              |  :
data-prepper              | java.lang.IllegalStateException: Duplicate key span.attributes.baz (attempted merging values 1 and 2)

Environment (please complete the following information):

• OS: Windows / linux - Data-preper is running on latest docker image
• Version: latest as of 11 April 2022

Thanks for the help!

Start with the OTelTraceRawPrepper entry point shown in the error log and reproduce the issue using the provided C# Activity example and collector configuration. Confirm that a span containing repeated baz attributes from an integer array is processed without the duplicate-key failure.