[receiver/cloudflare] Create logs receiver for Cloudflare LogPush API

[dehaansa]

Description: This pr implements a Cloudflare receiver that will receive logs sent from the LogPush API to allow users to collect logs from the Cloudflare logs aggregation system.

Link to tracking Issue: #19201

Testing: Unit & mock integration tests were created. Additionally, a LogPush job was created in my Cloudflare environment, and logs were written to file output locally to confirm expectations.

Documentation: The readme is quite thorough in addressing how to use the receiver and calls out potential pitfalls.

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test duration(43 minutes 55 seconds) has decreased 21 minutes 15 seconds compared to main branch avg(1 hour 5 minutes 10 seconds).

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⭕  build-and-test-windows workflow has finished in 6 seconds (43 minutes 5 seconds less than main branch avg.) and finished at 13th Mar, 2023.

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✅  telemetrygen workflow has finished in 1 minute 14 seconds (52 seconds less than main branch avg.) and finished at 13th Mar, 2023.

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✅  build-and-test workflow has finished in 43 minutes 55 seconds (21 minutes 15 seconds less than main branch avg.) and finished at 13th Mar, 2023.

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unittest-matrix (1.19, connector)	-     🔗	✅ 113  ❌ 0  ⏭ 0    🔗	See Details
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✅  prometheus-compliance-tests workflow has finished in 12 minutes 2 seconds (⚠️ 4 minutes 30 seconds more than main branch avg.) and finished at 13th Mar, 2023.

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✅  load-tests workflow has finished in 18 minutes 52 seconds (⚠️ 5 minutes 34 seconds more than main branch avg.) and finished at 13th Mar, 2023.

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✅  e2e-tests workflow has finished in 16 minutes 5 seconds and finished at 13th Mar, 2023.

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[djaglowski]

Overall this looks good. Just a bunch of minor cleanup suggestions.