Add webpack 5 support

[orlov-vo]

What kind of change does this PR introduce? (bugfix, feature, docs update, improvement)
feature

What is the current behavior? (You can also link to an open issue here)
Now it doesn't work with Webpack 5

What is the new behavior (if this is a feature change)?
It should work with Webpack 5

Does this PR introduce a breaking change?
no

Please check if the PR fulfills contributing guidelines
ok

It's is related with #359

[orlov-vo]

It seems like webpack-toolkit isn't compatible with webpack 5

$ yarn test:webpack-5
...
internal/modules/cjs/loader.js:626
    throw err;
    ^

Error: Cannot find module 'webpack/lib//MultiEntryPlugin'
Require stack:
- E:\projects\svg-sprite-loader\node_modules\webpack-toolkit\lib\addEntry.js
- E:\projects\svg-sprite-loader\node_modules\webpack-toolkit\index.js
- E:\projects\svg-sprite-loader\test\utils\create-compiler.js
- E:\projects\svg-sprite-loader\test\utils\index.js
- E:\projects\svg-sprite-loader\test\loader.test.js
- E:\projects\svg-sprite-loader\node_modules\mocha\lib\mocha.js
- E:\projects\svg-sprite-loader\node_modules\mocha\index.js
- E:\projects\svg-sprite-loader\node_modules\mocha\bin\_mocha

[sghoweri]

Any updates on this? Is Webpack v5 support planned / expected?

[zhongzhong0505]

Any updates on this?

[netconomy-stephan-dum]

please close this PR to avoid confusion as its already solved by:
#403