Optimize/scalar multiplication

[fbielejec]

No description provided.

[github-actions]

Circuit	Metric	Main branch	New code	% Change
New account	k	$${\color{red}11}$$	$${\color{green}10}$$	$${\color{green}-9.09\%}$$
New account	max_advice_rows	$${\color{red}1898}$$	$${\color{green}701}$$	$${\color{green}-63.07\%}$$
New account	max_fixed_rows	$${\color{green}210}$$	$${\color{red}645}$$	$${\color{red}207.14\%}$$
New account	max_rows	$${\color{red}1898}$$	$${\color{green}701}$$	$${\color{green}-63.07\%}$$
New account	proving key size	$${\color{red}21.2 MB}$$	$${\color{green}10.6 MB}$$	$${\color{green}-50.00\%}$$
New account	verification key size	$${\color{red}3.3 KB}$$	$${\color{green}2.1 KB}$$	$${\color{green}-36.36\%}$$

[pmikolajczyk41]

leftover

[fbielejec]

my bad, we can keep this test. Fixed