src: remove regex usage for env file parsing

This PR aims to remove regex usage for env file parsing, this will close:

• https://github.com/nodejs/node/issues/52248
• https://github.com/nodejs/node/issues/52084
• https://github.com/nodejs/node/issues/52466
• https://github.com/nodejs/node/pull/52266
• https://github.com/nodejs/node/pull/52363
• https://github.com/nodejs/node/pull/52120