feat: add toWebp() function

[StyleShit]

@bubkoo can you please review this?

This PR adds support for creating WebP screenshots

[biiibooo]

👋 @StyleShit

💖 Thanks for opening this pull request! 💖

Please follow the contributing guidelines. And we use semantic commit messages to streamline the release process.

Examples of commit messages with semantic prefixes:

• fix: don't overwrite prevent_default if default wasn't prevented
• feat: add graph.scale() method
• docs: graph.getShortestPath is now available

Things that will help get your PR across the finish line:

• Follow the TypeScript coding style.
• Run npm run lint locally to catch formatting errors earlier.
• Document any user-facing changes you've made.
• Include tests when adding/changing behavior.
• Include screenshots and animated GIFs whenever possible.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[biiibooo]

@StyleShit Please provide us with more info about this pull request.

[codecov]

Codecov Report

Patch coverage: 80.00% and no project coverage change.

Comparison is base (b751cbf) 62.93% compared to head (2eec6e4) 62.93%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #424   +/-   ##
=======================================
  Coverage   62.93%   62.93%           
=======================================
  Files          10       10           
  Lines         580      580           
  Branches      143      143           
=======================================
  Hits          365      365           
  Misses        151      151           
  Partials       64       64           

Files Changed	Coverage Δ
src/index.ts	89.47% <80.00%> (ø)

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