Example and pattern annotations are not respect for query and path parameters

🐛 Bug Report

Using the sample proto below, only default appears in the output json - example and pattern do not.

To Reproduce

message GetTileForImageRequest {
	// The unique reference number of the image.
	string image_urn = 1 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
		example: "urn:eagleview.com:v4:spatial-data:raster:visual:ated:QIgDbfZw-kqKfTxbMQXwhw:0",
		default: "urn:eagleview.com:v4:spatial-data:raster:visual:ated:QIgDbfZw-kqKfTxbMQXwhw:0",
		pattern: "^(urn:eagleview\\.com:v\\d+:spatial-data:\\w+:\\w+:\\w+:[A-Za-z0-9-_]+):(\\d+)$",
	}];
}

I'm using buf to generate the swagger using the following template:

buf.gen.swagger.yaml:

version: v1
plugins:
  - name: openapiv2
    out: build/go
    opt:
      - json_names_for_fields=false
      - visibility_restriction_selectors=LATEST

$ buf generate --template buf.gen.swagger.yaml --path proto/evt/iw/service

Expected behaviour

{
  "name": "image_urn",
  "description": "The unique reference number of the image.",
  "in": "path",
  "required": true,
  "type": "string",
  "example": "urn:eagleview.com:v4:spatial-data:raster:visual:ated:QIgDbfZw-kqKfTxbMQXwhw:0",
  "default": "urn:eagleview.com:v4:spatial-data:raster:visual:ated:QIgDbfZw-kqKfTxbMQXwhw:0",
  "pattern": "^(urn:eagleview\\.com:v\\d+:spatial-data:\\w+:\\w+:\\w+:[A-Za-z0-9-_]+):(\\d+)$"
}

Actual Behavior

{
  "name": "image_urn",
  "description": "The unique reference number of the image.",
  "in": "path",
  "required": true,
  "type": "string",
  "default": "urn:eagleview.com:v4:spatial-data:raster:visual:ated:QIgDbfZw-kqKfTxbMQXwhw:0"
}

Your Environment

$ uname -a
Linux 0664eeb787b5 5.14.0-1049-oem #56-Ubuntu SMP Fri Aug 12 10:23:08 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

$ protoc --version
libprotoc 25.3

Package	Version
github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-grpc-gateway	v2.19.1
github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2	v2.19.1
google.golang.org/protobuf/cmd/protoc-gen-go	v1.32.0