add tooltip showing grade and RMP data

[jakobqnen]

No description provided.

[jakobqnen]

added an icon next to the professor name in the column added by Skedge. When a name or the icon is hovered over, a tooltip appears, displaying grade and RMP data for that combo. The tooltip comes from the icon and wraps below the professor name being hovered on.

Skedge currently doesn't use the professor alias table from Trends, so data is not available for some professors. When data is not available, either [No grades data] or [No RMP data] is shown in the tooltip instead of the data.

The functions for getting Grades and RMP data were moved from app/index.tsx to a new file data/fetchGradesData.tsx . content.ts sends a message to the background/index.ts script to run the functions.