Support node v18 and hapi v21, drop node v12 and hapi v18/19

[geek]

• Support and test on hapi v21, drop support for hapi v19.
• Test ESM support.

[devinivy]

@geek The failing tests are due to DNS resolution changes in node v18, in the same vein as https://github.com/hapijs/hapi/pull/4357. If you merge this work into your PR I think they should be resolved: https://github.com/geek/nes/compare/v21-hapi...hapijs:nes:fix-node-v18-tests