feat: improve entry display and add highlighting

[cvigilv]

• Adjusted width of location and tags columns
• Added separate column for tags
• Implemented syntax highlighting for different parts of the entry
• Added headline level to the entry object for use in highlighting
• Modified make_display function to use the new structure and highlighting

[cvigilv]

Before:

Light	Dark

After:

Light	Dark

EDIT: Added "before" and "after" sections to show what this PR implements

[cvigilv]

I was thinking that maybe I could add some user configuration for the following:

1. Column-view (as shown here) or continuous-view (as previously defined)
2. Headline highlight group (currently defined as @org.headline.level<LEVEL>)
3. Tags highlight group (currently defined as @org.tag)
4. Column-view width (currently defined as {"file" = 16, "tags" = 24, "headline" = "remaining")

Let me know what you think, so I can proceed on implementing those user options and the continuous view we had before.

[cvigilv]

I was thinking on maybe adding the CATEGORY in the picker and allow the user to define (1) components to see on search and (ii) width of the components.

LMKWYT

[seflue]

Thank you for yor PR @cvigilv . I will try to have a look at it over the next weekend.