feat(accounts/mail): implement afew filters management

modules/home-manager/accounts/email/default.nix

@@ -63,7 +63,14 @@ in
             v.afew.mailMover
           else {}
         ) cfg.accountConfigs);
-    in {
+      mailFilterRules = lib.flatten (
+        lib.attrsets.mapAttrsToList (
+          n: v:
+          if lib.hasAttrByPath ["afew" "filters"] v then
+            v.afew.filters
+          else []
+        ) cfg.accountConfigs);
+      in {
       enable = true;
       extraConfig = ''
         [FolderNameFilter]
@@ -79,6 +86,7 @@ in
         [ArchiveSentMailsFilter]
         sent_tag = sent
         [InboxFilter]
+        ${lib.concatImapStrings (p: e: "\n\n[Filter.${toString p}]\n ${lib.concatStringsSep "\n" (lib.mapAttrsToList (n: v: "${n} = ${v}") e)}") mailFilterRules}
       '';
     };
     programs.neomutt = let