Tweaks and suggestions

[jorgebef]

After mistakenly "adding" semantic token support in #165 I have tested and am currently suggesting some tweaks to the highlight groups. I use them in my personal configuration, but I believe they could fit in with the colorscheme as a default if you agree.

• Interfaces in Typescript to be highlighted the same way as Types since they are extremely similar and in some cases almost interchangeable.
• @lsp.typemod.variable.defaultLibrary I believe should be linked to Builtin since it is essentially used for builtin variables/functions/methods.
• Operator is highlighted in almost all colorschemes in a red/orange color, I believe it to be a good idea to follow this pattern and maybe highlight with orange.base.

Here are some example screenshots.

Before:

After: