Truncate long declarations

[joshua-light]

Some of the record declarations are already too long, e.g.:

public record DocProperty(string Name, string Declaration, AccessModifier Access, DocComment Comment) : DocMember(Name, Declaration, Access, Comment)

We should consider adding some truncating logic that will check if the resulting definition is too long. For instance, in the snippet above there could be a newline inserted like this:

public record DocProperty(string Name, string Declaration, AccessModifier Access, DocComment Comment)
    : DocMember(Name, Declaration, Access, Comment)

Note: we need to consider leading spaces count in order to format the new line correctly.