Improve number formatting in allocation view

- numbers are formatted with thousands separators in the Allocation view similar to other views
- all numeric columns' text is aligned on the right hand side

BUG=277984

Review URL: https://codereview.chromium.org/219383003

git-svn-id: svn://svn.chromium.org/blink/trunk@170474 bbb929c8-8fbe-4397-9dbb-9b2b20218538