Move marketplace definitions to openhands.sdk.marketplace module #10944

Job	Run time
build-binary-and-test (ubuntu-latest)	2m 56s
build-binary-and-test (macos-latest)	2m 45s
Check OpenAPI Schema	32s
Build & Push (python-arm64)	8m 40s
Build & Push (java-amd64)	51s
Build & Push (java-arm64)	9m 0s
Build & Push (python-amd64)	3m 36s
Build & Push (golang-arm64)	7m 33s
Build & Push (golang-amd64)	3m 48s
Merge Multi-Arch Manifests (python)	13s
Merge Multi-Arch Manifests (java)	18s
Merge Multi-Arch Manifests (golang)	12s
Consolidate Build Information	4s
Update PR description with agent server image	4s
	40m 32s

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