[receiver/statsdreceiver] allow changing percentiles for summary types

[povilasv]

Description: <Describe what has changed.>

Allow selecting percentiles when using summary type:

receivers:
  statsd:
    endpoint: "0.0.0.0:8125"
   ...
    timer_histogram_mapping:
      - statsd_type: "timing"
        observer_type: "summary"
        summary: 
          percentiles: [0, 10, 50, 90, 95, 99, 100]

Link to tracking Issue: <Issue number if applicable>

https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/33701

Testing: <Describe what testing was performed and which tests were added.>

• local tests
• unit tets

Documentation: <Describe the documentation added.>

• updated

[povilasv]

gentle ping @jmacd / @dmitryax