Add gRPC/GraphQL/tRPC service detection with protobuf Route extraction

Pipeline: gRPC/GraphQL/tRPC client libs in service_patterns, edge emitters
in pass_parallel, __grpc__ Route nodes from .proto service defs in
pass_route_nodes, cross-repo matchers in pass_cross_repo. Also adds MQTT,
NATS, Dapr async patterns.

Protobuf extraction: service as Class, rpc as Function with rpc_name
fallback in func_name_node. Route nodes created by line-range matching
rpc Functions to enclosing service Classes.

Tested: Online Boutique protos produce 16 gRPC Route nodes.