Fix SQL whitespace handing in comments

[zregvart]

This fixes several issues to how whitespace was formatted related to
comments in SQL formatter:

• A line after the comment would get an additional leading space, this
  was especially visible for multi-line comments. For example:

  -- comment
  CREATE TABLE ...
  

  Would be formatted as:

  -- comment
   CREATE TABLE ...
  

• An inline comment would be indented and placed on a separate line.
  For example:

  CREATE TABLE products (
      category_id INTEGER, -- lookup in categories table
      color VARCHAR(50),
  )
  

  Would be formatted as:

  CREATE TABLE products (
      category_id INTEGER,
      -- lookup in categories table
  color VARCHAR(50),
  )
  

[nedtwigg]

Thanks for the PR! A few nits before we can merge:

• Move the changelog entry under a ### Fixed header
• Copy the changelog entry to plugin-gradle/CHANGES.md and plugin-maven/CHANGES.md
• Fix the tests on windows.

[zregvart]

@nedtwigg fixed

[nedtwigg]

Thanks for the PR. Released in plugin-maven 2.12.2 and plugin-gradle 5.14.2