Disable WebP By Default

*** 2022-09-12 UPDATE ***
@matt published a post and codified a final decision that WebP by default would not be coming to WordPress Core in version 6.1. That being the case, this plugin will not be necessary for users to prevent WebP generation by default as part of the Core upload process.

Proposed to be included in WordPress 6.0 is a new feature to generate and use webp images by default. Specifically, when an image is uploaded, a WebP version of every image subsize is created. According to the proposal, one downside is that generating WebP versions along with the original JPEGs will “use an additional ~70% of the storage space to store both file types.” Although this is hugely beneficial to most websites and, more importantly, their visitors, some site owners may not b…