This PR implements model-based theory combination for grind linarith.
Example:
```lean
example [CommRing α] [LinearOrder α] [Ring.IsOrdered α] (f : α → α → α) (x y z : α)
: z ≤ x → x ≤ 1 → z = 1 → f x y = 2 → f 1 y = 2 := by
grind
```
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| .. | ||
| bench | ||
| compiler | ||
| elabissues | ||
| ir | ||
| lean | ||
| pkg | ||
| playground | ||
| plugin | ||
| simpperf | ||
| .gitignore | ||
| common.sh | ||
| lean-toolchain | ||