[Feature Request] Add Pick and Omit to the result methods

[danielo515]

Describe the feature you want
I want to be able to provide to the result methods a list of fields to include when transforming them into frontmatter string or

Wanted API

tR += result.asFrontmatterString({omit:['code']})

Expected behavior
Code should ommited when transforming to frontmatter string

Additional context
Will be very useful to re-use the same sets of results on several contexts

[danielo515]

This is not a bug, it should be a feature request. Currently none of the Result methods admit pick or omit, so they are just silently ignored.