feat: port LinearAlgebra.Finrank (#3378)

Co-authored-by: Parcly Taxel <reddeloostw@gmail.com>
Co-authored-by: ChrisHughes24 <chrishughes24@gmail.com>
Co-authored-by: Pol_tta <65514131+Ruben-VandeVelde@users.noreply.github.com>
Co-authored-by: EmilieUthaiwat <emiliepathum@gmail.com>
Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
Co-authored-by: Yaël Dillies <yael.dillies@gmail.com>
Co-authored-by: Jireh Loreaux <loreaujy@gmail.com>
Co-authored-by: Gabriel Ebner <gebner@gebner.org>
Co-authored-by: Violeta Hernández <vi.hdz.p@gmail.com>
Co-authored-by: Chris Hughes <chrishughes24@gmail.com>
Co-authored-by: Floris van Doorn <fpvdoorn@gmail.com>
Co-authored-by: Eric Rodriguez <ericrboidi@gmail.com>
Co-authored-by: Ruben Van de Velde <65514131+Ruben-VandeVelde@users.noreply.github.com>
Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

Mathlib.lean

@@ -1268,6 +1268,7 @@ import Mathlib.LinearAlgebra.Dfinsupp
 import Mathlib.LinearAlgebra.Dimension
 import Mathlib.LinearAlgebra.DirectSum.Finsupp
 import Mathlib.LinearAlgebra.DirectSum.TensorProduct
+import Mathlib.LinearAlgebra.Finrank
 import Mathlib.LinearAlgebra.Finsupp
 import Mathlib.LinearAlgebra.FinsuppVectorSpace
 import Mathlib.LinearAlgebra.FreeAlgebra