feat(agent-server): add token-level streaming support to agent server WebSocket #10870

Job	Run time
Check OpenAPI Schema	32s
build-binary-and-test (ubuntu-latest)	2m 59s
Build & Push (golang-amd64)	8m 2s
build-binary-and-test (macos-latest)	3m 10s
Build & Push (golang-arm64)	7m 37s
Build & Push (java-amd64)	7m 52s
Build & Push (java-arm64)	7m 34s
Build & Push (python-amd64)	10m 23s
Build & Push (python-arm64)	7m 13s
Merge Multi-Arch Manifests (golang)	25s
Merge Multi-Arch Manifests (python)	16s
Merge Multi-Arch Manifests (java)	19s
Consolidate Build Information	6s
Update PR description with agent server image	4s
	56m 32s

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