Need an `adjustMultilineComment` feature analog for `babel-generator` code generation

[usergenic]

escodegen had an adjustMultilineComment option which I assumed helped keep multiline comments properly within max-line-length as indents changed etc.

babel-generator has no such feature, and we may want to add something to do the same thing now that escodegen is no longer available to use on these ASTs.

[rictic]

I always thought adjustMultilineComment was for the leading indentation of subsequent lines. For example, if you add a level of indentation, this comment:

/**
 * Foo
 * Bar
 */

Should become:

  /**
   * Foo
   * Bar
   */

rather than

  /**
 * Foo
 * Bar
 */

[rictic]

(but +1 to preserving this functionality)

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.