feat: new syntax highlighter

[Jurredr]

Problem

The current syntax highlighter lacks proper tokenization control, thus leading to unattractive syntax highlighting.

Solution

Swap out prism.js by highlight.js. The library shiki.js has also been considered, but has not been used given its strictly asynchronous nature.

Old

New

Important note

A proper color mapping still needs to be added, possibly a dynamic one consuming variables from VSCode.

Tests

• I have tested this change on VSCode
• I have tested this change on JetBrains

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dogusata]

2 more important things:

• Please triple check if the reference tracker highlights are still working as expected (which are already part of the e2e tests, however checking manually would also be beneficial here)
• Please update the third party licenses file, since this is an open source library, it has to have those information on the root. Remove prismjs and add highlightjs (and any additional third part library you put to make highlightjs work as expected)

[dogusata]

Added just a small nit related with the 3rd party clone usage and comments. Please remove the comments in your next pr, if we're not using it directly from node_modules for some reason, the code should follow our guidelines not anyone elses.