GCS plugin is very slow in admin media grid mode #75

When I access Media library (grid mode), GCS plugin call google storage many time (each image a time).
And it's take more than 20s for showing all image in first page.

`Content-Type: application/json
x-goog-api-client: gl-php/8.0.7 gccl/1.25.1 wp-gcs/0.1.6 wp/5.7.2

• Mark bundle as not supporting multiuse
  < HTTP/1.1 200 OK
  < X-GUploader-UploadID: ADPycdvVsGkb8xYAvA5DgqMmrfU9NV5x5_Zlpkzl5Yhr7LuBsEh9gwwMkE_yEisq5rC6plV7SckuWR_8X3jrGdIuLmsvKf4qOQ
  < Content-Type: application/json; charset=UTF-8
  < Date: Wed, 06 Oct 2021 03:12:07 GMT
  < Vary: Origin
  < Vary: X-Origin
  < Cache-Control: private, max-age=0, must-revalidate, no-transform
  < Expires: Wed, 06 Oct 2021 03:12:07 GMT
  < Content-Length: 2
  < Server: UploadServer
  < Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000,h3-T051=":443"; ma=2592000,h3-Q050=":443"; ma=2592000,h3-Q046=":443"; ma=2592000,h3-Q043=":443"; ma=2592000,quic=":443"; ma=2592000; v="46,43"
  <
• Connection #0 to host storage.googleapis.com left intact
• Found bundle for host storage.googleapis.com: 0x7f66093b14e0 [serially]
• Re-using existing connection! (#0) with host storage.googleapis.com
• Connected to storage.googleapis.com (216.58.200.80) port 443 (#0)

GET /storage/v1/b/bucket_name/o/1%2F2021%2F09%2Fmac3-scaled.jpg?prettyPrint=false HTTP/1.1
Host: storage.googleapis.com
User-Agent: gcloud-php/1.25.1
Authorization: Bearer ...`

This is profiling in webgrind: