feat: add colors for blink.cmp label matches

[rnxden]

Problem: cmp and blink.cmp are configured with different completion menu colors, when they should be (relatively) similar (for standardization/convention purposes).

Solution: Update blink.cmp colors to match those of cmp. Also added a color for BlinkCmpLabelMatch, the highlight for matched portions of completion items.

[rnxden]

I also noticed that many other "match" colors, like telescope.nvim's TelescopeMatching and snack.nvim's SnacksPickerMatch are colored as palette.blossom, I'm wondering if that could be a better color for the completion menu matches too? Please let me know what your thoughts on this are.

[mcchrish]

Hi @rnxden, I think it make sense to me. Let's give it a try. Can you show a screenshot of what will look like?

[rnxden]

Of course:

Here's what it currently looks like:

The colors are darker but it fits the theme a bit more. If you'd like, we could keep the current one and instead update the cmp colors?

[rnxden]

If you prefer the current colors, I wish to add the following highlights (currently used in my personal config) in order to add a match color (BlinkCmpLabelMatch) like so:

Let me know your thoughts on this. Thanks

[mcchrish]

Thank you so much! I like the one with blossom color matching. Let's go for it.

[rnxden]

Thanks for the feedback! I've reverted the previous commit and added the changes for the blossom color matching (and updated the PR title to match the change more closely).

[mcchrish]

Thanks! Merging.