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>

src/i18n/locale/en.json

@@ -849,6 +849,7 @@
   "components.Settings.SettingsJobsCache.runnow": "Run Now",
   "components.Settings.SettingsJobsCache.sonarr-scan": "Sonarr Scan",
   "components.Settings.SettingsJobsCache.unknownJob": "Unknown Job",
+  "components.Settings.SettingsJobsCache.usersavatars": "Users' Avatars",
   "components.Settings.SettingsLogs.copiedLogMessage": "Copied log message to clipboard.",
   "components.Settings.SettingsLogs.copyToClipboard": "Copy to Clipboard",
   "components.Settings.SettingsLogs.extraData": "Additional Data",
@@ -968,6 +969,7 @@
   "components.Settings.address": "Address",
   "components.Settings.addsonarr": "Add Sonarr Server",
   "components.Settings.advancedTooltip": "Incorrectly configuring this setting may result in broken functionality",
+  "components.Settings.apiKey": "API key",
   "components.Settings.cancelscan": "Cancel Scan",
   "components.Settings.copied": "Copied API key to clipboard.",
   "components.Settings.currentlibrary": "Current Library: {name}",