feat(a2a): implement M12 A2A server (#98) #17

Job	Run time
Build (x86_64-unknown-linux-gnu)	4m 28s
Build (x86_64-apple-darwin)	6m 54s
Build (x86_64-pc-windows-msvc)	8m 29s
Build (aarch64-unknown-linux-gnu)	4m 26s
Build (aarch64-apple-darwin)	5m 8s
Publish Docker Image	4m 46s
Create GitHub Release	7s
	34m 18s

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