Replace the use of toArray by Array.from

[jtpio]

#6736 inadvertently brought the toArray utility from @lumino/algorithm:

notebook/packages/notebook-extension/src/trusted.tsx

Line 21 in 44eb35e

const cells = toArray(model.cells);

With Lumino 2, we should now be able to use Array.from instead.

Which means this import can be removed here:

notebook/packages/notebook-extension/src/trusted.tsx

Line 7 in 44eb35e

import { toArray } from '@lumino/algorithm';

[jtpio]

Marking as a good first issue if someone would like to take a look!

[SamantaTarun]

I'd like to work on this issue. Please assign it to me.

[jtpio]

Sure, thanks @tarunsamanta2k20!

[revanthsonu]

If the issue is still open, I would like to work on it. Please assign it to me

[jtpio]

Whoever wants to open a new PR please do!

[SamantaTarun]

@revanthsonu @jtpio i submitted a pr. No need to create new PR.