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/waystones-sable.pw.toml

@@ -0,0 +1,13 @@
+name = "Waystones: Sable (Create Aeronautics Addon)"
+filename = "waystonessable-1.0.7.jar"
+side = "both"
+
+[download]
+url = "https://cdn.modrinth.com/data/BxhPGfcK/versions/Wot8Pf4C/waystonessable-1.0.7.jar"
+hash-format = "sha512"
+hash = "20b677c77baf5fd33cccf1ac2bf80220d7162d30ca33dc04516285690f8fac9392a4789b57545b5fd20014213a1f55812ad6e2efd3518a2ba77a9a54bc6ab51a"
+
+[update]
+[update.modrinth]
+mod-id = "BxhPGfcK"
+version = "Wot8Pf4C"