[Merged by Bors] - feat(ring_theory/tensor_product): add assoc for tensor product as an algebra homomorphism #13309
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By speeding up a commented out def, this goes from from ~100s to ~7s on my machine .
Co-authored-by: Scott Morrison scott@tqft.net
Cc @semorrison who wrote this originally
It would be nice to understand the reason this is necessary, but I don't have good ideas for how to debug this
Vasily Ilin wants to make use of this, so any suggestions for additional helpful API are welcome :)