Adopt dynamic docker stats functionality

[rmfitzpatrick]

Description:
Adding a feature - Adds a core docker event loop to allow the collector to monitor docker stats for containers that were not running during the initialization of the receiver. Also sources the docker stats receiver as a top level component.

Link to tracking Issue: resolves #957

Testing: Includes additional unit and integration tests. Also adds a remove container feature to the test container helpers to assist in verifying dynamic container monitoring.

Documentation: will add to changelog

[codecov]

Codecov Report

Merging #958 into master will increase coverage by 13.92%.
The diff coverage is 95.89%.

@@             Coverage Diff             @@
##           master     #958       +/-   ##
===========================================
+ Coverage   74.88%   88.80%   +13.92%     
===========================================
  Files          21      249      +228     
  Lines        1071    13355    +12284     
===========================================
+ Hits          802    11860    +11058     
- Misses        213     1142      +929     
- Partials       56      353      +297     

Flag	Coverage Δ
#integration	76.39% <84.93%> (+1.50%)	⬆️
#unit	87.82% <50.00%> (?)

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

Impacted Files	Coverage Δ
receiver/dockerstatsreceiver/docker.go	92.93% <94.23%> (+20.00%)	⬆️
internal/common/testing/container/container.go	78.02% <100.00%> (+4.21%)	⬆️
receiver/dockerstatsreceiver/receiver.go	97.10% <100.00%> (+12.02%)	⬆️
.../kubeletstatsreceiver/kubelet/metadata_provider.go	100.00% <0.00%> (ø)
...sformprocessor/operation_aggregate_label_values.go	100.00% <0.00%> (ø)
receiver/carbonreceiver/reporter.go	86.84% <0.00%> (ø)
extension/jmxmetricsextension/extension.go	100.00% <0.00%> (ø)
.../awsxrayreceiver/internal/translator/translator.go	100.00% <0.00%> (ø)
...rcedetectionprocessor/internal/gcp/gce/metadata.go	100.00% <0.00%> (ø)
processor/k8sprocessor/factory.go	100.00% <0.00%> (ø)
... and 233 more

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[rmfitzpatrick]

Load test failures shouldn't be relevant to these changes.

[tigrannajaryan]

@bogdandrutu assigned to you since you already reviewed.

[tigrannajaryan]

LGTM.

@bogdandrutu you had comments, are you OK to merge or you still have questions?

[bogdandrutu]

@tigrannajaryan my main concerns were addressed, I had not look in more details but I trust you did :)

[rmfitzpatrick]

@tigrannajaryan is this ok to land?