Coding Standards

Hello @GGH

I have checked the error reported by PHPCS and have applied automated fixes

It still needs work as some of the issues remaining

Please review and suggest if any other changes are required
I have tested using the following command

phpcs --standard="Drupal,DrupalPractice" --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml ./

PHPCS and PHPSTAN are pending

Thanks for your efforts. I will keep this issue open for the upcoming contributions.
I did not take over all changes.
I did not update the .js file, since the changes do corrupt the functionality. Please test before contributing.