Add assembleStorage and disassembleStorage methods for DEN

[KyleVaughn]

Description:

Add assemble storage and disassemble storage functions to the Dense matrix class

Tasks:

• [ ] Write an assemble function
  • Inputs are number of rows and number of columns
  • Allocates an array A that is nrows x ncols
• [ ] Write a disassemble function
  • Input is the dense matrix A
  • Deletes A

Definition of done:

This task is done when it passes the unit test which will test whether the storage has been created or destroyed.

[KyleVaughn]

Review by @sthvkbht

[sthvkbht]

Tasks are well defined and on point for the issue being addressed. 👍

[sthvkbht]

Implementation compiles and seems to carry out the described tasks.