processor/transform: add exemplar OTTL context support #42375

Job	Run time
changedfiles	1m 30s
scoped-tests-matrix (windows-11-arm)	19m 6s
scoped-tests-matrix (ubuntu-latest)	2m 50s
scoped-tests-matrix (windows-2025)	24m 33s
scoped-tests-matrix (windows-2022)	15m 10s
scoped-tests	2s
	1h 3m 11s

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