Release v8.0.3

[msimerson]

• move templates into directory
• chore: prettier automated code formatting
• dep: eslint-plugin-haraka -> @haraka/eslint-config
• update 'lint' script in package.json
• populate [files] in package.json. Delete .npmignore.
• ci: only publish when package.json modified
• doc(CONTRIBUTORS): added
• Create index-template/v8.json (Create index-template-map_es8.json #54), fixes Creating Index is not working on elasticsearch 8.1.x #43