fead: add OpenTelemetry observability support for modular inputs #1121

Job	Run time
meta	11s
pre-commit	22s
compliance-copyrights	29s
fossa-scan	3m 5s
test-unit 3.9	2m 5s
test-unit 3.11	1m 58s
test-unit 3.12	2m 2s
test-unit 3.13	2m 14s
test-unit 3.10	2m 4s
semgrep / sast-scan	48s
test-splunk (9.3.2, d8bb32809498, false, false)	3m 2s
test-splunk (9.4.0, 6b4ebe426ca6, true, false)	2m 28s
publish	53s
	21m 41s

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