Add GitHub Actions workflow for weekly traffic data collection

- Introduced a new workflow to collect and append weekly repo traffic data (views and unique visitors) to CSV files.
- The workflow fetches data from the GitHub Traffic API and handles date management to ensure accurate data recording.
- Includes steps for determining the last recorded date, fetching new traffic data, appending to CSV files, and creating a pull request with a summary of the collected data.

Author: DanWahlin

.github/uv-stats.csv .github/uvs.csv.github/uv-stats.csv renamed to .github/uvs.csv

@@ -0,0 +1,27 @@
+"03/04",440
+"03/05",882
+"03/06",901
+"03/07",408
+"03/08",508
+"03/09",2359
+"03/10",6105
+"03/11",10619
+"03/12",5823
+"03/13",5712
+"03/14",2333
+"03/15",2457
+"03/16",4647
+"03/17",4207
+"03/18",3387
+"03/19",3657
+"03/20",4366
+"03/21",2028
+"03/22",1882
+"03/23",3847
+"03/24",3178
+"03/25",3212
+"03/26",4008
+"03/27",3695
+"03/28",2022
+"03/29",2197
+"03/30",3458