Continuing on anchoring and improvements on Nu's overall internal commands (#2635).
`move column` sub command has been turned into the command `move` since
we use it to move exclusively columns. Examples added as well.
Fixed it to carry along any anchor locations that might be in place if
table to be moved originates from other sources.
* Add global mode to str trim
The global mode allows skipping non-string values,
and processes rows and tables as well
* Add tests to action with ActionMode::Global
