Add formatters (#16)

Honestly, it was hard to choose packages because many packages don't have the `stylelint-formatter` keyword.
So, I selected personally reliable packages only.

.github/workflows/test-ecosystem.yml

@@ -31,11 +31,15 @@ jobs:
           - '@primer/stylelint-config'
           - '@pro-vision/stylelint-config-pv'
           - '@ronilaukkarinen/stylelint-a11y'
+          - '@scalvert/stylelint-formatter-sonarqube'
           - '@shopify/stylelint-plugin'
           - '@stylistic/stylelint-config'
           - '@stylistic/stylelint-plugin'
           - '@wordpress/stylelint-config'
+          - 'stylelint-actions-formatters'
           - 'stylelint-browser-compat'
+          - 'stylelint-checkstyle-reporter'
+          - 'stylelint-codeframe-formatter'
           - 'stylelint-config-ali'
           - 'stylelint-config-astro'
           - 'stylelint-config-bod'
@@ -73,6 +77,7 @@ jobs:
           - 'stylelint-declaration-strict-value'
           - 'stylelint-define-config'
           - 'stylelint-file-max-lines'
+          - 'stylelint-formatter-pretty'
           - 'stylelint-gamut'
           - 'stylelint-group-selectors'
           - 'stylelint-high-performance-animation'