fead: add OpenTelemetry observability support for modular inputs #1118

Job	Run time
meta	9s
fossa-scan	48s
compliance-copyrights	28s
pre-commit	33s
semgrep / sast-scan	33s
test-unit 3.13	1m 58s
test-unit 3.11	2m 0s
test-unit 3.10	2m 1s
test-unit 3.12	1m 59s
test-unit 3.9	2m 8s
test-splunk (9.3.2, d8bb32809498, false, false)	3m 44s
test-splunk (9.4.0, 6b4ebe426ca6, true, false)	3m 4s
publish	1m 0s
	20m 25s

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