Add Strands Agents plugin (contrib) #5376

Job	Run time
test-latest-deps	10m 47s
check-protos	8m 15s
cloud-test	1m 58s
features-tests / test	8m 27s
build-lint-test (3.10, ubuntu-arm)	11m 31s
build-lint-test (3.14, ubuntu-arm)	11m 37s
build-lint-test (3.14, macos-arm)	10m 31s
build-lint-test (3.14, windows-latest)	21m 25s
build-lint-test (3.10, ubuntu-latest)	14m 28s
build-lint-test (3.10, windows-latest)	19m 5s
build-lint-test (3.14, ubuntu-latest)	16m 47s
build-lint-test (3.10, macos-arm)	10m 17s
	2h 25m 8s

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