Adds the groundwork needed in order to persist multi-line suggestions,
while providing the parsing strategy which will be reused for the
**Preview** as well.
Adds outdated, lines_above and lines_below columns to
suggestions table.
outdated - boolean which represents whether the suggestion
is outdated or not. For instance, if any line changed after
you left the multi-line suggestion, even though the note
is not outdated, it helps tracking if the content has changed
in the latest file. We cache this information in a column given
it's not a cheap operation to do for every suggestion in the
request time.
lines_below, lines_above - persists the parsed arguments from
`suggestion:-10+3` syntax, where `10` would be lines_above and
3 lines_below. We need that to dynamically calculate which
lines we should monitor for outdating / persisting the correct
content in from_content column.
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