mj-table does not respect cellspacing attribute

[dazgreer]

Describe the bug
When applying cellspacing, the result ignores the set value due to border-collapse being set to collapse.

To Reproduce
Steps to reproduce the behavior:
https://mjml.io/try-it-live/qWRH2wFJDD

Expected behavior
There should be visible cellspacing around the table cells

MJML environment (please complete the following information):
https://mjml.io/try-it-live/qWRH2wFJDD

Email sending environment(for rendering issues):
N/A

Affected email clients (for rendering issues):
N/A