sage.modules, sage.matrix: Remove import-time dependencies on the symbolic ring

[mkoeppe]

(cherry-picked from #32432)

CC: @kliem @tscrim

Component: linear algebra

Author: Matthias Koeppe

Branch/Commit: acca6c2

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/32593

[mkoeppe]

Branch: u/mkoeppe/sage_modules__sage_matrix__remove_import_time_dependencies_on_the_symbolic_ring

[mkoeppe]

Commit: acca6c2

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

New commits:

1b0a5ab	src/sage/modules/vector_space_morphism.py: Do not fail if sage.symbol is not present
83b5038	src/sage/modules/free_module_element.pyx: Move import from sage.misc.derivative into method
acca6c2	src/sage/matrix/matrix2.pyx: Move import from sage.misc.derivative into method

[tscrim]

Reviewer: Travis Scrimshaw

[tscrim]

comment:3

LGTM (assuming a green patchbot).

[mkoeppe]

comment:4

Thanks!

[vbraun]

Changed branch from u/mkoeppe/sage_modules__sage_matrix__remove_import_time_dependencies_on_the_symbolic_ring to acca6c2