generate multiple java files

From https://protobuf.dev/reference/java/java-generated/#invocation
When the option java_multiple_files = true is enabled,
Then the compiler will also create separate .java files for each
of the classes/enums which it will generate for each top-level
message, enumeration, and service declared in the .proto file.

The goal is to have this option stop generating "OuterClass" named
classes for better ergonomics.

Author: vroldanbet

authzed/api/v1/core.proto

@@ -3,6 +3,7 @@ package authzed.api.v1;
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 import "google/protobuf/struct.proto";
 import "validate/validate.proto";

authzed/api/v1/debug.proto

@@ -8,6 +8,7 @@ import "google/protobuf/duration.proto";
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 // DebugInformation defines debug information returned by an API call in a footer when
 // requested with a specific debugging header.

authzed/api/v1/error_reason.proto

@@ -3,6 +3,7 @@ package authzed.api.v1;
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 // Defines the supported values for `google.rpc.ErrorInfo.reason` for the
 // `authzed.com` error domain.

authzed/api/v1/experimental_service.proto

@@ -3,6 +3,7 @@ package authzed.api.v1;
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 import "google/api/annotations.proto";
 import "validate/validate.proto";

authzed/api/v1/openapi.proto

@@ -3,6 +3,7 @@ package authzed.api.v1;
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 import "protoc-gen-openapiv2/options/annotations.proto";
 

authzed/api/v1/permission_service.proto

@@ -3,6 +3,7 @@ package authzed.api.v1;
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 import "google/protobuf/struct.proto";
 import "google/api/annotations.proto";

authzed/api/v1/schema_service.proto

@@ -3,6 +3,7 @@ package authzed.api.v1;
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 import "google/api/annotations.proto";
 import "validate/validate.proto";

authzed/api/v1/watch_service.proto

@@ -3,6 +3,7 @@ package authzed.api.v1;
 
 option go_package = "github.com/authzed/authzed-go/proto/authzed/api/v1";
 option java_package = "com.authzed.api.v1";
+option java_multiple_files = true;
 
 import "google/api/annotations.proto";
 import "validate/validate.proto";