Add Strands Agents plugin (contrib) #5389

Job	Run time
cloud-test	1m 52s
build-lint-test (3.10, macos-arm)	10m 19s
check-protos	8m 20s
build-lint-test (3.14, windows-latest)	15m 25s
build-lint-test (3.14, ubuntu-latest)	19m 6s
build-lint-test (3.10, windows-latest)	19m 38s
features-tests / test	8m 28s
build-lint-test (3.14, ubuntu-arm)	10m 47s
build-lint-test (3.14, macos-arm)	12m 20s
build-lint-test (3.10, ubuntu-latest)	15m 12s
test-latest-deps	10m 32s
build-lint-test (3.10, ubuntu-arm)	10m 38s
	2h 22m 37s

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