Make MRF and Quarantine work with tuples

This is for be-mr pleroma!2964 (closed) and issue pleroma#1850 (closed)

The idea is to also give a reason instead of only a list of rejected/muted/etc. instances.

Most of the changes are done in the BE, but some are done here.

• Change in the admin-fe to make tuples properly work for MRF and Quarantine
• Give other names to 'Key' and 'Value'
• Backwards compat (This version should still work on an old pleroma)

Example

src/store/modules/normalizers.js

@@ -78,7 +78,9 @@ export const parseTuples = (tuples, key) => {
       item.tuple[0] === ':replace' ||
       item.tuple[0] === ':retries' ||
       (item.tuple[0] === ':headers' && key === 'Pleroma.Web.MediaProxy.Invalidation.Http') ||
-      item.tuple[0] === ':crontab')) {
+      item.tuple[0] === ':crontab' ||
+      item.tuple[0] === ':quarantined_instances' ||
+      key === ':mrf_simple')) {
       if (item.tuple[0] === ':crontab') {
         accum[item.tuple[0]] = item.tuple[1].reduce((acc, group) => {
           return [...acc, { [group.tuple[1]]: { value: group.tuple[0], id: `f${(~~(Math.random() * 1e8)).toString(16)}` }}]