fead: add OpenTelemetry observability support for modular inputs #1126

Job	Run time
pre-commit	22s
meta	12s
fossa-scan	59s
compliance-copyrights	32s
test-unit 3.11	1m 54s
test-unit 3.12	1m 58s
test-unit 3.13	1m 58s
test-unit 3.10	1m 55s
test-unit 3.9	2m 1s
semgrep / sast-scan	35s
test-splunk (9.3.2, d8bb32809498, false, false)	3m 28s
test-splunk (9.4.0, 6b4ebe426ca6, true, false)	2m 57s
publish	1m 8s
	19m 59s

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