server: Add support for users' avatars in GrahpQL

Cargo.lock

@@ -2115,6 +2115,7 @@ dependencies = [
  "futures-util",
  "hmac 0.10.1",
  "http",
+ "image",
  "itertools",
  "juniper",
  "juniper_actix",
@@ -2133,6 +2134,7 @@ dependencies = [
  "sea-query-binder",
  "secstr",
  "serde",
+ "serde_bytes",
  "serde_json",
  "sha2",
  "sqlx",
@@ -3317,6 +3319,15 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde_bytes"
+version = "0.11.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfc50e8183eeeb6178dcb167ae34a8051d63535023ae38b5d8d12beae193d37b"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.137"