Support line breaks and tab replacement in tabular table values

[mrsdizzie]

This adds the same functionality from both #179 and #181 to the tabular table output. In WP CLI behat tests, the 'table containing rows' check can only use tabular table output so we need to fix it here as well in order for tests to work (as seen in wp-cli/wp-cli#6055).

Before:

post_id	meta_key	meta_value
1	foo	foo
1	fruits	apple
banana
mango
1	bar	br

After:

post_id	meta_key	meta_value
1	foo	foo
1	fruits	apple
		banana
		mango
1	bar	br

[mrsdizzie]

I verified that the test in that PR which was failing now works with this new code:

$ composer behat -vvvv -- features/formatter.feature:157 --format pretty

Feature: Format output

  Scenario: Table rows containing linebreaks            # features/formatter.feature:157
.    Given an empty directory                            # WP_CLI\Tests\Context\FeatureContext::given_an_empty_directory()
.    And a file.php file:                                # WP_CLI\Tests\Context\FeatureContext::given_a_specific_file()
      """
      <?php
      $items      = array(
        (object) array(
          'post_id'    => 1,
          'meta_key'   => 'foo',
          'meta_value' => 'foo',
        ),
        (object) array(
          'post_id'    => 1,
          'meta_key'   => 'fruits',
          'meta_value' => "apple\nbanana\nmango",
        ),
        (object) array(
          'post_id'    => 1,
          'meta_key'   => 'bar',
          'meta_value' => 'br',
        ),
      );
      $assoc_args = array();
      $formatter  = new WP_CLI\Formatter( $assoc_args, array( 'post_id', 'meta_key', 'meta_value' ) );
      $formatter->display_items( $items );
      """
.    When I run `wp eval-file file.php --skip-wordpress` # WP_CLI\Tests\Context\FeatureContext::when_i_run()
.    Then STDOUT should be a table containing rows:      # WP_CLI\Tests\Context\FeatureContext::then_stdout_should_be_a_table_containing_rows()
      | post_id | meta_key | meta_value |
      | 1       | foo      | foo        |
      | 1       | fruits   | apple      |
      |         |          | banana     |
      |         |          | mango      |
      | 1       | bar      | br         |



1 scenario (1 passed)
4 steps (4 passed)
0m0.55s (11.60Mb)

[swissspidy]

Amazing! Thanks!