Fail on generating LCM types with eigen_lcm.Vector10d+ etc

[aaron-skydio]

This should fail at generation time, currently fails to find the expected bindings at compile time

We currently also don’t handle 2d matrices at all really. We generate all matrices as 1d storage vectors. eigen_lcm also only has square matrices and vectors, so if we want to generate matrices and not just storage, we’ll have to fail on non-square matrices.