Feature to extract players ID in FBREF

[michaelromagne]

This PR adds an option in the read_player_season_stats method. When extracting player statistics, it may be interesting to get the URL to the player page as well. This way, we can get additional information in our application with a simple scraping on the player page (for instance, the player picture).

[codecov]

Codecov Report

Attention: Patch coverage is 68.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 73.75%. Comparing base (69fb0de) to head (43615c7).
Report is 248 commits behind head on master.

Files with missing lines	Patch %	Lines
soccerdata/fbref.py	65.21%	6 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #806       +/-   ##
===========================================
+ Coverage   59.33%   73.75%   +14.41%     
===========================================
  Files          11       26       +15     
  Lines        1633     2496      +863     
  Branches      336      341        +5     
===========================================
+ Hits          969     1841      +872     
+ Misses        610      575       -35     
- Partials       54       80       +26     

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[probberechts]

I would actually prefer only including the player id in the output, as discussed here: #728. This is more compact and it still allows reconstructing the URL. Furthermore, I would not make this optional and would do it for all functions, not only for read_player_season_stats.

[michaelromagne]

Hi @probberechts ! After your recommendations, I did something cleaner. I added the option to get the player ID directly from the html parsing function. Could you tell me which other functions would benefit from this feature apart from read_player_season_stats ?

[michaelromagne]

@probberechts coming back on this, are you able to merge it soon ?