Preserve indentation level and line break position when using --yaml-roundtrip

[ivangreene]

When using yaml-roundtrip, the style of blocks is preserved, but the indentation and position of line breaks is not. Example:

test.yml:

test: >
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
    tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
    veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
    commodo consequat. Duis aute irure dolor in reprehenderit in voluptate
    velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
    cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id
    est laborum.

yq -Y . test.yml:

test: >
  Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt
  ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation
  ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in
  reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur
  sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit
  anim id est laborum.

My use case is using yq to programmatically edit large YAML files that are checked in to source control. It is preferable in this case to have the smallest amount of changes possible, and no changes which do not impact the actual data.

Not sure of the feasibility of detecting these types of differences. I am sure it is less straightforward than simply detecting the style of a block/scalar