feat(download): add file size calculation for DownloadService

This allows the browser to show file size and a time estimate for downloading files.
Does not work for ZipOutputStreams though since dir size doesn't match the zip file size.
Also added no-cache headers so browser won't start caching downloads.

frontend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "frontend",
-  "version": "1.2.3-SNAPSHOT",
+  "version": "1.2.4-SNAPSHOT",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "frontend",
-      "version": "1.2.3-SNAPSHOT",
+      "version": "1.2.4-SNAPSHOT",
       "dependencies": {
         "@angular/animations": "^14.0.0",
         "@angular/cdk": "^14.1.0",

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "frontend",
-  "version": "1.2.3-SNAPSHOT",
+  "version": "1.2.4-SNAPSHOT",
   "scripts": {
     "ng": "ng",
     "start": "ng serve",