feat: release managed service generation and contract diagnostics

examples/contracts/managed.api

@@ -0,0 +1,57 @@
+syntax = "v1"
+
+// Error definitions are intentionally owned by Go, not duplicated here.
+@app (
+    defaultResponse: CommonResponse
+)
+response CommonResponse (
+    codeType: int32
+    successCode: 0
+    errorCode: 9999
+    messageField: msg
+    dataMode: always
+    requestIdField: "-"
+)
+response AlternateResponse (
+    codeType: int32
+    successCode: 0
+    errorCode: 9999
+    messageField: detail
+    dataMode: always
+    requestIdField: "-"
+)
+type CheckReq {
+    Kind string `form:"kind,optional"`
+}
+type Receipt {
+    Bytes int64 `json:"bytes"`
+}
+@server (group: demo)
+service managed-api {
+    @handler check
+    get /check (CheckReq) returns (Receipt)
+
+    @handler other
+    @response AlternateResponse
+    get /other (CheckReq) returns (Receipt)
+
+    @handler rawJSON
+    @response raw
+    get /raw returns (Receipt)
+
+    @handler upload
+    @body (mode: multipart; maxBytes: 2048)
+    post /upload returns (Receipt)
+
+    @handler callback
+    @body (mode: raw; maxBytes: 64)
+    @produces "text/plain"
+    post /callback
+
+    @handler download
+    @produces "application/octet-stream"
+    get /download
+
+    @handler slow
+    get /slow returns (Receipt)
+}