[receiver/statsd] Add Option to Aggregate on IP/Host

[daidokoro]

Description: <Describe what has changed.>

The statsdreceiver only aggregates metrics on protocol+host+ip, this leads to issues or inconsistencies when dealing with clients that constantly switch tcp/udp ports. To address the issue, this PR adds a configuration option enableIPOnlyAggregation that allows the use to specify if they want to aggregate on the IP instead of IP+Port.

For example:

otel_config.yaml:

receivers:
  statsd:
    endpoint: "0.0.0.0:8125"
    enable_metric_type: true
    is_monotonic_counter: false
    aggregation_interval: 10s
    enable_ip_only_aggregation: true # <-- enable ip only aggregation
    timer_histogram_mapping:
      - statsd_type: "timing"
        observer_type: "histogram"
        histogram: 
          max_size: 50  

exporters:
  debug:
    verbosity: detailed

service:
  pipelines:
    metrics:
      receivers:
        - statsd
      exporters:
        - debug

run:

STATSD_HOST="localhost"
STATSD_PORT=8125

for port in {10000..10010}; do
  echo -n "my.metric:1|c" | nc -w 1 -u -p $port ${STATSD_HOST} ${STATSD_PORT}
  echo "Sent from port $port"
done

result:

2024-08-26T23:36:00.224+0200    info    ResourceMetrics #0
Resource SchemaURL: 
ScopeMetrics #0
ScopeMetrics SchemaURL: 
InstrumentationScope otelcol/statsdreceiver 0.103.0-dev
Metric #0
Descriptor:
     -> Name: -n my.metric
     -> Description: 
     -> Unit: 
     -> DataType: Sum
     -> IsMonotonic: false
     -> AggregationTemporality: Delta
NumberDataPoints #0
Data point attributes:
     -> metric_type: Str(counter)
StartTimestamp: 2024-08-26 21:35:50.223101 +0000 UTC
Timestamp: 2024-08-26 21:36:00.224252 +0000 UTC
Value: 7
        {"kind": "exporter", "data_type": "metrics", "name": "debug"}
2024-08-26T23:36:10.224+0200    info    MetricsExporter {"kind": "exporter", "data_type": "metrics", "name": "debug", "resource metrics": 1, "metrics": 1, "data points": 1}
2024-08-26T23:36:10.224+0200    info    ResourceMetrics #0
Resource SchemaURL: 
ScopeMetrics #0
ScopeMetrics SchemaURL: 
InstrumentationScope otelcol/statsdreceiver 0.103.0-dev
Metric #0
Descriptor:
     -> Name: -n my.metric
     -> Description: 
     -> Unit: 
     -> DataType: Sum
     -> IsMonotonic: false
     -> AggregationTemporality: Delta
NumberDataPoints #0
Data point attributes:
     -> metric_type: Str(counter)
StartTimestamp: 2024-08-26 21:36:00.224252 +0000 UTC
Timestamp: 2024-08-26 21:36:10.224607 +0000 UTC
Value: 4
        {"kind": "exporter", "data_type": "metrics", "name": "debug"}

Instead of generating 11 metrics for each port that was used to send, only 2 metrics are blocks are returned, who's values total 11.

Link to tracking Issue: #23809

Testing:

• [x] Added unit tests

Documentation: <Describe the documentation added.>

• [x] Added information to the statsdreceiver README.md describing the option.