fead: add OpenTelemetry observability support for modular inputs #1125

Job	Run time
fossa-scan	47s
compliance-copyrights	29s
pre-commit	23s
test-unit 3.10	1m 57s
test-unit 3.11	2m 2s
test-unit 3.9	2m 3s
test-unit 3.13	1m 57s
semgrep / sast-scan	40s
test-unit 3.12	2m 3s
meta	12s
test-splunk (9.3.2, d8bb32809498, false, false)	3m 12s
test-splunk (9.4.0, 6b4ebe426ca6, true, false)	2m 58s
publish	1m 5s
	19m 48s

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