[StatsD receiver] Change OpenCensus type to OpenTelemetry type for statsD receiver

[gavindoudou]

Description:

1. Change StatsD receiver to use OpenTelemetry type instead of OpenCensus type.
2. Revise some typos in readme

Link to tracking Issue: #2732

Testing: revised unit tests

[codecov]

Codecov Report

Merging #2733 (1123208) into main (f8c550f) will increase coverage by 1.09%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##             main    #2733      +/-   ##
==========================================
+ Coverage   90.53%   91.63%   +1.09%     
==========================================
  Files         444      446       +2     
  Lines       21984    22042      +58     
==========================================
+ Hits        19904    20198     +294     
+ Misses       1618     1379     -239     
- Partials      462      465       +3     

Flag	Coverage Δ
integration	69.18% <ø> (?)
unit	90.56% <96.15%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
receiver/statsdreceiver/protocol/statsd_parser.go	98.14% <90.90%> (+0.12%)	⬆️
...eiver/statsdreceiver/protocol/metric_translator.go	100.00% <100.00%> (ø)
receiver/statsdreceiver/receiver.go	92.98% <100.00%> (-0.24%)	⬇️
processor/groupbytraceprocessor/event.go	95.96% <0.00%> (-0.81%)	⬇️
internal/common/testing/container/container.go	73.68% <0.00%> (ø)
...rometheusexecreceiver/subprocessmanager/manager.go	76.00% <0.00%> (+6.00%)	⬆️
exporter/signalfxexporter/dimensions/requests.go	92.15% <0.00%> (+9.80%)	⬆️
receiver/jmxreceiver/receiver.go	94.80% <0.00%> (+16.88%)	⬆️
receiver/dockerstatsreceiver/docker.go	92.30% <0.00%> (+39.05%)	⬆️
... and 6 more

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[jmacd]

🎉