Add auto PR generation (#48)

* Remap 1.21.6 to Mojang mappings

* start working on automation

* update newVersion script to use manifest

* update scripts

* update doc

* add dispatchable bump workflow

* update workflow env

* update workflows

versions.json

@@ -0,0 +1,24 @@
+[
+  "1.7",
+  "1.8.9",
+  "1.9.4",
+  "1.10.2",
+  "1.11.2",
+  "1.12.2",
+  "1.13",
+  "1.14",
+  "1.15",
+  "1.16",
+  "1.17",
+  "1.18",
+  "22w19a",
+  "1.19",
+  "1.19.2",
+  "1.20",
+  "1.20.4",
+  "1.20.5",
+  "1.21",
+  "1.21.3",
+  "1.21.5",
+  "1.21.6"
+]