Enable flight.Server to register additional grpc services

[asfimport]

The grpc.Server is unexported within flight.Server (code ref); therefore, it's not possible to register additional grpc services, such as health check, reflection, on the flight.Server.

Usage:

import (
	"google.golang.org/grpc/health"
	"google.golang.org/grpc/health/grpc_health_v1"
	"google.golang.org/grpc/reflection"
)


	s := flight.NewFlightServer()

	// Enable health check.
	grpc_health_v1.RegisterHealthServer(s, health.NewServer())

	// Enable reflection for grpcurl.
	reflection.Register(s)

Reporter: Jie Zhang / @jiezhang
Assignee: Jie Zhang / @jiezhang

PRs and other links:

• GitHub Pull Request #13995

_{Note: This issue was originally created as ARROW-17553. Please see the migration documentation for further details.}

[asfimport]

Matthew Topol / @zeroshade:
Issue resolved by pull request 13995
#13995