Adds generic modular rooms (#79419)

## About The Pull Request
Atomized portion of the bitrunning content patch #78997. Anyone can use
these, they are not bitrunning specific. Comes with a few biomes in
sizes 7x7, 9x9, 11x11

<details>
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</details>

## Why It's Good For The Game
Adds some replay value, just slot in the modular root and select a
preset
## Changelog
N/A nothing player facing

code/modules/mapfluff/ruins/generic.dm

@@ -0,0 +1,3 @@
+/obj/modular_map_root/generic
+	config_file = "strings/modular_maps/generic.toml"
+