fead: add OpenTelemetry observability support for modular inputs #1123

Job	Run time
pre-commit	18s
meta	7s
fossa-scan	44s
compliance-copyrights	30s
test-unit 3.9	2m 6s
test-unit 3.11	1m 59s
test-unit 3.12	2m 2s
semgrep / sast-scan	1m 34s
test-unit 3.13	2m 0s
test-unit 3.10	2m 5s
test-splunk (9.4.0, 6b4ebe426ca6, true, false)	2m 54s
test-splunk (9.3.2, d8bb32809498, false, false)	3m 10s
publish	-1s
	19m 28s

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