Create a setting via metadata to drive the trimming of the column value

## Background
usually the values in fixed width forma columns might have some trailing spaces. That can disable parsing of non-string types.

## Feature
Create a code accepting a metadata setting driving the trimming of the column values, overriding the global setting.

## Proposed Solution
Suggested metadata field name: `trim`.
Accepted type `boolean` or `string` convertible to boolean.