lokiexporter: Add to binary

[gramidt]

Description:
Add the Loki exporter to the binary, so members of the community can start utilizing it without requiring a custom build.

Link to tracking Issue:
#1894

Testing:
Several iterations of this exporter have been used in a private distribution of the collector with minimal issues. All issues identified through testing have been resolved and enhancements have been documented via GH Issues.

Documentation:
https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/exporter/lokiexporter/README.md

Signed-off-by: Granville Schmidt 1246157+gramidt@users.noreply.github.com

[codecov]

Codecov Report

Merging #2387 (c08deec) into main (e43c235) will increase coverage by 0.97%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2387      +/-   ##
==========================================
+ Coverage   72.72%   73.70%   +0.97%     
==========================================
  Files         410      411       +1     
  Lines       25355    25432      +77     
==========================================
+ Hits        18440    18745     +305     
+ Misses       6368     6133     -235     
- Partials      547      554       +7     

Flag	Coverage Δ
integration	69.22% <0.00%> (?)
unit	72.72% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
cmd/otelcontribcol/components.go	87.17% <100.00%> (+0.16%)	⬆️
internal/common/testing/container/container.go	73.68% <0.00%> (ø)
receiver/jmxreceiver/receiver.go	94.80% <0.00%> (+16.88%)	⬆️
receiver/dockerstatsreceiver/docker.go	92.30% <0.00%> (+39.05%)	⬆️
receiver/dockerstatsreceiver/receiver.go	96.72% <0.00%> (+47.54%)	⬆️
receiver/jmxreceiver/subprocess/subprocess.go	96.55% <0.00%> (+74.48%)	⬆️
receiver/redisreceiver/receiver.go	87.50% <0.00%> (+87.50%)	⬆️
receiver/redisreceiver/client.go	100.00% <0.00%> (+100.00%)	⬆️
receiver/redisreceiver/factory.go	100.00% <0.00%> (+100.00%)	⬆️
...eceiver/jmxreceiver/subprocess/subprocess_linux.go	100.00% <0.00%> (+100.00%)	⬆️

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[gramidt]

Closing PR as there are some gaps in coverage that were not caught in earlier PRs. Will re-open after they're addressed.