refactor: Proxy and cache avatar images (#907)

* refactor: proxy and cache user avatar images

* fix: extract keys

* fix: set avatar image URL

* fix: show the correct avatar in the list of available users in advanced request

* fix(s): set correct src URL for cached image

* fix: remove unexpired unused image when a user changes their avatar

* fix: requested changes

* refactor: use 'mime' package to detmerine file extension

* style: grammar

* refactor: checks if the default avatar is cached to avoid creating duplicates for different users

* fix: fix vulnerability

* fix: fix incomplete URL substring sanitization

* refactor: only cache avatar with http url protocol

* fix: remove log and correctly set the if statement for the cached image component

* fix: avatar images not showing on issues page

* style: formatting

---------

Co-authored-by: JoaquinOlivero <joaquin.olivero@hotmail.com>

package.json

@@ -62,6 +62,7 @@
     "formik": "^2.4.6",
     "gravatar-url": "3.1.0",
     "lodash": "4.17.21",
+    "mime": "3",
     "next": "^14.2.4",
     "node-cache": "5.1.2",
     "node-gyp": "9.3.1",
@@ -119,6 +120,7 @@
     "@types/express": "4.17.17",
     "@types/express-session": "1.17.6",
     "@types/lodash": "4.14.191",
+    "@types/mime": "3",
     "@types/node": "20.14.8",
     "@types/node-schedule": "2.1.0",
     "@types/nodemailer": "6.4.7",