[receiver/snowflakereceiver] add client and config

[shalper2]

Description: Implementing client.go and config.go.

Link to tracking Issue: 14754

Testing: limited unit testing as missing factory.go limits the ability to test. Sql mocking for client.go.

Documentation: Added documentation referring to config.go including an example config.

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(4 seconds) has decreased 43 minutes 42 seconds compared to main branch avg(43 minutes 46 seconds).

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⭕  build-and-test-windows workflow has finished in 4 seconds (43 minutes 35 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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Job	Failed Steps	Tests
windows-unittest-matrix	-     🔗	N/A	See Details
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✅  check-links workflow has finished in 38 seconds (2 minutes 54 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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✅  tracegen workflow has finished in 56 seconds (2 minutes 57 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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✅  changelog workflow has finished in 1 minute 57 seconds (7 minutes 5 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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✅  prometheus-compliance-tests workflow has finished in 10 minutes 50 seconds and finished at 20th Dec, 2022.

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✅  load-tests workflow has finished in 16 minutes 10 seconds and finished at 20th Dec, 2022.

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Job	Failed Steps	Tests
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details

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✅  build-and-test workflow has finished in 34 minutes 38 seconds (25 minutes 27 seconds less than main branch avg.) and finished at 20th Dec, 2022.

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Job	Failed Steps	Tests
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1871  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details
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[dmitryax]

@shalper2 I'll review it in detail tomorrow. Please rebase and make sure all tests pass. I see at least one lint job is failing. Rebase is needed because we've just recovered the broken CI #17037

[dmitryax]

Overall looks pretty good. Just a couple of nits. And please rebase so we can merge it