creating undo interfaces folder

src/shared/interfaces/index.ts

src/shared/interfaces/undoRedo/content.interface.ts

src/shared/interfaces/undoRedo/edge.interface.ts

src/shared/interfaces/undoRedo/form.interface.ts

src/shared/interfaces/undoRedo/index.ts

src/shared/interfaces/undoRedo/node.interface.ts

src/shared/interfaces/undoRedo/undoRedoAction.interface.ts

src/shared/stores/undoRedo/functions/content.ts