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Add forwardAuthorization flag for conditional token forwarding (#147) #349

Job	Run time
build (mcp-auth-proxy-windows-amd64.exe, windows, amd64)	53s
build (mcp-auth-proxy-windows-arm64.exe, windows, arm64)	20s
build (mcp-auth-proxy-darwin-amd64, darwin, amd64)	1m 4s
build (mcp-auth-proxy-linux-amd64, linux, amd64)	57s
build (mcp-auth-proxy-linux-arm64, linux, arm64)	57s
build (mcp-auth-proxy-darwin-arm64, darwin, arm64)	47s
	4m 58s

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