feat: reverse shares (#86)

* add first concept

* add reverse share funcionality to frontend

* allow creator to limit share expiration

* moved reverse share in seperate module

* add table to manage reverse shares

* delete complete share if reverse share was deleted

* optimize function names

* add db migration

* enable reverse share email notifications

* fix config variable descriptions

* fix migration for new installations

backend/src/share/share.module.ts

@@ -3,6 +3,7 @@ import { JwtModule } from "@nestjs/jwt";
 import { ClamScanModule } from "src/clamscan/clamscan.module";
 import { EmailModule } from "src/email/email.module";
 import { FileModule } from "src/file/file.module";
+import { ReverseShareModule } from "src/reverseShare/reverseShare.module";
 import { ShareController } from "./share.controller";
 import { ShareService } from "./share.service";
 
@@ -11,6 +12,7 @@ import { ShareService } from "./share.service";
     JwtModule.register({}),
     EmailModule,
     ClamScanModule,
+    ReverseShareModule,
     forwardRef(() => FileModule),
   ],
   controllers: [ShareController],