Enhance test, fix coding style and static analysis

[peter279k]

Changed log

• Add php-7.4 version test during Travis CI build.
• Fix coding style via PHP-CS-Fixer on GitHub actions.
• Fix static analysis error via PHPStan on GitHub actions.
• Add some path and message to ignoreErrors block on phpstan.neon.dist.
  It can pass some unnecessary error during static analysis error.
• Installing some suggested dependencies to avoid most of errors during PHPStan static analysis.
• According to this issue, it should upgrade the doctrine/annotations version to 1.8 to fix this issue.

[peter279k]

@Nyholm, please look at this PR at your available time. Thanks :).