fead: add OpenTelemetry observability support for modular inputs (#450) #1128

Job	Run time
meta	12s
compliance-copyrights	27s
pre-commit	36s
semgrep / sast-scan	34s
fossa-scan	1m 2s
test-unit 3.9	2m 5s
test-unit 3.12	1m 55s
test-unit 3.10	2m 2s
test-unit 3.13	2m 0s
test-unit 3.11	1m 56s
test-splunk (9.4.0, 6b4ebe426ca6, true, false)	3m 7s
test-splunk (9.3.2, d8bb32809498, false, false)	3m 36s
publish	1m 44s
	21m 16s

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