[extension/awslogs_encoding] implement streaming contract for WAF logs #32822

Job	Run time
changedfiles	1m 18s
scoped-tests-matrix (ubuntu-latest)	2m 32s
scoped-tests-matrix (windows-2022)	7m 56s
scoped-tests-matrix (windows-11-arm)	32m 21s
scoped-tests-matrix (windows-2025)	10m 17s
scoped-tests	3s
	54m 27s

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