feat: migrate from gRPC to connectRPC

[ravisuhag]

Summary

• Replace gRPC server, gRPC-gateway, and associated middleware with connectRPC, following the pattern established by Compass
• Native support for Connect, gRPC, and gRPC-Web protocols on a single HTTP port with standard net/http routing
• Uses proton commit 8ef3e30 (feat(stencil): migrate proto to connectRPC with buf.validate proton#481)

Changes

Code generation

• buf.gen.yaml upgraded to v2 with protocolbuffers/go + connectrpc/go plugins
• Generated code moves from proto/ to gen/

Server (internal/server/)

• Rewritten using http.ServeMux + connectRPC handler + h2c + CORS
• Removed graceful.go, newrelic.go (inlined shutdown, dropped NewRelic)

API handlers (internal/api/)

• All handlers adopt connect.Request[T] / connect.Response[T] generics
• Custom HTTP handlers for schema binary endpoints use Go 1.22 http.ServeMux patterns
• Removed gRPC health check (ping.go), replaced with plain HTTP /ping

CLI client (cmd/)

• All 13 cmd files use connectRPC client over plain HTTP instead of grpc.Dial
• Error handling uses connect.Error codes instead of grpc/status

Middleware (internal/middleware/)

• New recovery.go, logger.go, error_response.go interceptors
• Error response middleware maps StorageErr to proper connect error codes

Errors & formats

• StorageErr.GRPCStatus() → StorageErr.ConnectError()
• runtime.HTTPStatusError → connect.NewError in avro/json/protobuf format packages

Config

• Removed GRPCConfig, NewRelicConfig
• Added CORSConfig, flat MaxRecvMsgSize/MaxSendMsgSize

Removed

• proto/ directory (old generated code, swagger docs)
• pkg/validator/ (replaced by connectrpc.com/validate)
• grpc-gateway, go-grpc-middleware, nrgrpc dependencies

Test plan

• go build ./... passes
• go test ./... passes (except pre-existing formats/protobuf failure due to missing protoc)
• Server starts and serves on configured port
• gRPC clients work via grpcurl
• Custom schema HTTP endpoints work via curl
• /ping returns pong

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c9b57d03-c023-4398-9db1-36b0b6208ede

📥 Commits

Reviewing files that changed from the base of the PR and between d8b65a7 and a18ea5b.

⛔ Files ignored due to path filters (6)

• gen/raystack/stencil/v1beta1/stencil.pb.go is excluded by !**/*.pb.go, !**/gen/**
• gen/raystack/stencil/v1beta1/stencilv1beta1connect/stencil.connect.go is excluded by !**/gen/**
• go.sum is excluded by !**/*.sum
• proto/raystack/stencil/v1beta1/stencil.pb.go is excluded by !**/*.pb.go
• proto/raystack/stencil/v1beta1/stencil.pb.gw.go is excluded by !**/*.pb.gw.go
• proto/raystack/stencil/v1beta1/stencil_grpc.pb.go is excluded by !**/*.pb.go

📒 Files selected for processing (41)

• Makefile
• buf.gen.yaml
• cmd/check.go
• cmd/client.go
• cmd/create.go
• cmd/delete.go
• cmd/diff.go
• cmd/download.go
• cmd/edit.go
• cmd/graph.go
• cmd/info.go
• cmd/list.go
• cmd/namespace.go
• cmd/print.go
• cmd/schema.go
• cmd/search.go
• config/config.go
• formats/avro/provider.go
• formats/avro/schema.go
• formats/json/provider.go
• formats/protobuf/error.go
• go.mod
• internal/api/api.go
• internal/api/api_test.go
• internal/api/namespace.go
• internal/api/ping.go
• internal/api/schema.go
• internal/api/schema_test.go
• internal/api/search.go
• internal/middleware/error_response.go
• internal/middleware/logger.go
• internal/middleware/recovery.go
• internal/server/graceful.go
• internal/server/newrelic.go
• internal/server/server.go
• internal/store/errors.go
• pkg/validator/validator.go
• proto/apidocs.swagger.json
• proto/raystack/stencil/v1beta1/stencil.pb.validate.go
• proto/raystack/stencil/v1beta1/stencil.swagger.json
• proto/raystack/stencil/v1beta1/stencil.swagger.md

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