updated dependencies and added cleanup script using del-cli

[Shrimpstronaut]

 @types/chai                        ^4.3.0  →   ^4.3.1     
 @types/mocha                       ^9.1.0  →   ^9.1.1     
 @typescript-eslint/eslint-plugin  ^5.15.0  →  ^5.25.0     
 @typescript-eslint/parser         ^5.15.0  →  ^5.25.0     
 eslint                            ^8.11.0  →  ^8.15.0     
 karma                             ^6.3.17  →  ^6.3.20     
 mocha                              ^9.2.2  →  ^10.0.0     
 ts-loader                          ^9.2.8  →   ^9.3.0     
 typescript                         ^4.6.2  →   ^4.6.4     
 webpack                           ^5.70.0  →  ^5.72.1     
 webpack-dev-server                 ^4.7.4  →   ^4.9.0

This commit also includes a new NPM run script. By running npm run clean, the compiled sources are removed ( index.js and index.d.ts).

The clean script will now also run as part of the build script.