[receiver/loki] Added new component

[mar4uk]

Description:
New component Loki Receiver.
The Loki receiver implements the Loki push api as specified here. It allows Promtail instances to specify the open telemetry collector as their lokiAddress.

This PR is implementing component skeleton, the logic will be implemented in the next PR #19217
Link to tracking Issue: #18635

Testing: Added unit tests

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(3 seconds) has decreased 39 minutes 6 seconds compared to main branch avg(39 minutes 9 seconds).

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✅  telemetrygen workflow has finished in 1 minute 11 seconds (34 seconds less than main branch avg.) and finished at 17th Mar, 2023.

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Job	Failed Steps	Tests
build-dev	-     🔗	N/A	See Details
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publish-stable	-     🔗	N/A	See Details

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✅  check-links workflow has finished in 1 minute 36 seconds and finished at 17th Mar, 2023.

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✅  build-and-test workflow has finished in 41 minutes 11 seconds (13 minutes 24 seconds less than main branch avg.) and finished at 17th Mar, 2023.

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unittest-matrix (1.19, connector)	-     🔗	✅ 126  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.20, extension)	-     🔗	✅ 543  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2610  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-0)	-     🔗	✅ 2610  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, exporter)	-     🔗	✅ 2492  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	-     🔗	✅ 2492  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, other)	-     🔗	✅ 4728  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1958  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, other)	-     🔗	✅ 4728  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.20, receiver-1)	-     🔗	✅ 1958  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	-     🔗	✅ 55  ❌ 0  ⏭ 0    🔗	See Details
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✅  prometheus-compliance-tests workflow has finished in 13 minutes 15 seconds (⚠️ 5 minutes 59 seconds more than main branch avg.) and finished at 17th Mar, 2023.

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Job	Failed Steps	Tests
prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

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✅  load-tests workflow has finished in 15 minutes 25 seconds (⚠️ 3 minutes 2 seconds more than main branch avg.) and finished at 17th Mar, 2023.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
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loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 18  ❌ 0  ⏭ 0    🔗	See Details
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✅  e2e-tests workflow has finished in 19 minutes 8 seconds (⚠️ 3 minutes 55 seconds more than main branch avg.) and finished at 17th Mar, 2023.

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Job	Failed Steps	Tests
kubernetes-test (v1.26.0)	-     🔗	N/A	See Details
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⭕  build-and-test-windows workflow has finished in 3 seconds (39 minutes 6 seconds less than main branch avg.) and finished at 18th Mar, 2023.

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Job	Failed Steps	Tests
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✅  changelog workflow has finished in 2 minutes 30 seconds and finished at 18th Mar, 2023.

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[atoulme]

LGTM

[dmitryax]

@kovrus PTAL as a sponsor

[kovrus]

LGTM!

[codeboten]

This seems incorrect

[mar4uk]

yeah.. it is because of the limit of 220 entries in dependabot... each time a new component is added to dependabot, the last one is removed from the list

• /testbed/mockdatareceivers/mockawsxrayreceiver was cut here [receiver/cloudflare] Create logs receiver for Cloudflare LogPush API #19379
• /testbed/mockdatasenders/mockdatadogagentexporter was cut here [receiver/webhookevent] First commit #19377

This issue occurred last week #19410

The issue with dependabot shouldn't block adding new components probably