gitserver: grpc: create exhaustive logger for repository service (#62158)

This PR builds on https://github.com/sourcegraph/sourcegraph/pull/61270, and adds the request logging funcionality to the repository grpc server in gitserver.

## Test plan

Local testing:

Ran `env SRC_GITSERVER_EXHAUSTIVE_LOGGING_ENABLED=true SRC_LOG_SCOPE_LEVEL=gitserver.gRPCRequestLogger=debug sg start` locally, and saw the following output from the logger in my terminal (note that specifically the repository service is mentioned):

```
[    gitserver-0] DEBUG gitserver.gRPCRequestLogger internal/server_grpc_logger.go:46 Handled FetchRepository RPC {"server": "gitserver.v1.GitserverRepositoryService", "method": "FetchRepository", "status": "OK", "traceID": "67f1aa837367fa7ea72b164e70a67419", "duration": "1.068438833s", "request": {"repoName": "github.com/sgtest/megarepo"}}
```

Author: ggilmore

CHANGELOG.md

@@ -21,7 +21,8 @@ All notable changes to Sourcegraph are documented in this file.
 - Added syntax highlighting for the [Pkl](https://pkl-lang.org/) configuration language. [#61478](https://github.com/sourcegraph/sourcegraph/pull/61478)
 - New `rev:at.time()` search filter that allows you to search a branch at a point in time. [#61513](https://github.com/sourcegraph/sourcegraph/pull/61513)
 - "cody.contextFilters" field to the site config. Admins can set include and exclude rules to define which repositories Cody can use as context in its requests to third-party LLMs. [#61101](https://github.com/sourcegraph/sourcegraph/pull/61101), [#61641](https://github.com/sourcegraph/sourcegraph/pull/61641)
-- Added exhaustive logging for all gRPC requests sent to gitserver. This feature is off by default, and can be enabled by setting the `SRC_GITSERVER_EXHAUSTIVE_LOGGING_ENABLED` environment variable to `true`. [#61270](https://github.com/sourcegraph/sourcegraph/pull/61270)
+- Added exhaustive logging for all gRPC requests sent to gitserver service gitserver. This feature is off by default, and can be enabled by setting the `SRC_GITSERVER_EXHAUSTIVE_LOGGING_ENABLED` environment variable to `true`. [#61270](https://github.com/sourcegraph/sourcegraph/pull/61270)
+- Added exhaustive logging for all gRPC requests sent to the repository service in gitserver. This feature is off by default, and can be enabled by setting the `SRC_GITSERVER_EXHAUSTIVE_LOGGING_ENABLED` environment variable to `true`. [#62158](https://github.com/sourcegraph/sourcegraph/pull/62158)
 
 ### Changed
 

cmd/gitserver/internal/repositoryservice.go

@@ -15,14 +15,29 @@ import (
 	"github.com/sourcegraph/sourcegraph/lib/errors"
 )
 
-func NewRepositoryServiceServer(server *Server) proto.GitserverRepositoryServiceServer {
-	return &repositoryServiceServer{
+type GRPCRepositoryServiceConfig struct {
+	ExhaustiveRequestLoggingEnabled bool
+}
+
+func NewRepositoryServiceServer(server *Server, config *GRPCRepositoryServiceConfig) proto.GitserverRepositoryServiceServer {
+	var srv proto.GitserverRepositoryServiceServer = &repositoryServiceServer{
 		logger:   server.logger,
 		db:       server.db,
 		hostname: server.hostname,
 		svc:      server,
 		fs:       server.fs,
 	}
+
+	if config.ExhaustiveRequestLoggingEnabled {
+		logger := server.logger.Scoped("gRPCRequestLogger")
+
+		srv = &loggingRepositoryServiceServer{
+			base:   srv,
+			logger: logger,
+		}
+	}
+
+	return srv
 }
 
 type repositoryServiceServer struct {