fix: remove tns-core-modules dependency in order to allow @nativescrip/core migration

[DimitarTachev]

PR Checklist

• [x] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• [x] There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• [x] You have signed the [CLA].
• [x] All existing tests are passing: https://github.com/NativeScript/nativescript-dev-webpack/blob/master/CONTRIBUTING.md#testing-locally-by-running-e2e-tests
• [ ] Tests for the changes are included.

What is the current behavior?

The plugin depends on tns-core-modules.

What is the new behavior?

The plugin does not depend on tns-core-modules.

P.S. This PR should not change anything in the business logic as the parse method content is the same.

Old: https://github.com/NativeScript/NativeScript/blob/fc2a233e9598def50969247c1516c32260b7e283/nativescript-core/css/lib/parse/index.js New: https://github.com/reworkcss/css/blob/v2.2.1/lib/parse/index.js

Related to: https://github.com/NativeScript/nativescript-dev-webpack/issues/1089

[DimitarTachev]

test webpack-apps cli-smoke