feat(pack): add Waystones and its compatibility addons

Adds Waystones plus two integrations that hook mods already in the pack:
Waystones: Sable (Create Aeronautics addon) and Xaero's Minimap & World
Map - Waystones Compatibility.

packwiz auto-resolved Balm as Waystones' required library; it was then
added explicitly as well, which was a no-op, so there is only one Balm
metafile.

Balm's Modrinth environment is client_or_server, which packwiz flags as
ambiguous ("one of these is unnecessary") and records as side = both.
That is the right call here: Balm is a library needed wherever Waystones
runs, and Waystones is client_and_server.

All four pinned versions are NeoForge 1.21.1 releases, and each jar's
sha512 was re-verified against its recorded hash.

mods/xaeros-minimap-world-map-waystones-compatibility-forge.pw.toml

@@ -0,0 +1,13 @@
+name = "Xaero's Minimap & World Map - Waystones Compatibility"
+filename = "xaeros_waystones_compatibility-NeoForge-1.21.1-2.1.0.jar"
+side = "both"
+
+[download]
+url = "https://cdn.modrinth.com/data/7mLhyqIY/versions/k8wIAiWT/xaeros_waystones_compatibility-NeoForge-1.21.1-2.1.0.jar"
+hash-format = "sha512"
+hash = "440da659b1c406ff410841248a28adba60b73f3d91f513ba335b9e5d44b3e48ab63d5ecc86484ff1e3d1a4f7830ad7566fc1efec2a03eba3c958b414b61feea0"
+
+[update]
+[update.modrinth]
+mod-id = "7mLhyqIY"
+version = "k8wIAiWT"