html-formatter: reclassify webpack-bundled dependencies to be dev dependencies

[davidjgoss]

Summary

Change dependencies that are wrapped into the webpack bundle to be devDependencies, to reduce unnecessary dependency footprint of cucumber-js and projects which consume it.

Motivation and Context

Because cucumber-js depends on @cucumber/html-formatter, it brings any dependencies with it. Currently that includes several cucumber packages plus react and react-dom which isn't necessary since these are inlined into the JS bundle by webpack so we don't need them when we're using the already-built package. It's also confusing for users and the extend dependency tree can cause other issues. See:

• new unsatisfied peer dependencies with latest verion cucumber-js#1516
• why does cucumber require react for angular app? cucumber-js#1536

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• The change has been ported to Java.
• The change has been ported to Ruby.
• The change has been ported to JavaScript.
• The change has been ported to Go.
• The change has been ported to .NET.
• I've added tests for my code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have updated the CHANGELOG accordingly.

[davidjgoss]

Almost missed the runtime import of CSS from @cucumber/react in https://github.com/cucumber/cucumber/blob/master/html-formatter/javascript/src/cli-main.ts#L33

To address, we'll either have webpack handle bundling the CSS, or maybe just create a copy of that file as part of this package's build.