add some missing non-square matrix funcs

[recp]

add missing functions for new non-square matrices:

• [x] copy
• [x] zero
• [x] mul
• [x] mulv
• [x] transpose
• [x] scale

[EasyIP2023]

@recp Do you need any help with this MR. I can write some docs for you.

[recp]

@EasyIP2023 thanks, it would be nice to have docs and tests yes ;)

[EasyIP2023]

@recp Question is glm_mat2x3_transpose supposed to be glm_mat2x3_transpose_to?

[EasyIP2023]

@recp Nevermind just thought about why