Add support for scraping Sofascore

[ksbharaj]

Hi All. I have included some code to scrape Sofascore. It's fairly basic now, focussed only on the top 5 leagues. I can add more functions going forward. Happy to get any feedback to help me improve it.

[probberechts]

Hi. Thanks for your contribution. Does Sofascore provide any data that is not yet covered by the scrapers that are already implemented? I am somewhat hesitant to add more sources that provide exactly the same data, because each data source comes with a maintenance cost.

[ksbharaj]

Apologies for my delayed response. Github's stopped emailing me notifications - my responses will be quicker next time. Yes, Sofascore does. I've listed its distinguishing qualities below:

• Inclusion of match momentum data
• Inclusion of player heatmap and average positions (possible to extract from WhoScored event data, but that requires far more code and takes much, much more time to scrape than Sofascore does)
• Inclusion of all useful details in ShotMap (such as xG, xGOT, shot time and location). The other sources tend to lack at least one of these in their shotmaps.

I understand your concerns on the maintenance side. However, I'm happy to manage it for SofaScore going forward if possible.

[ksbharaj]

Also worth mentioning is that I haven't included the listed features above in this initial commit- I intended for the initial commit to be simple. I can add it in the coming days- should not take too much time/effort.

[probberechts]

Thanks for the clarification. For me, the most important requirement is that a few tests are added and that the docs are updated. Extra features can be added later.

[ksbharaj]

I agree. I will work towards that then. Thank you!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.61702% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 65.15%. Comparing base (69fb0de) to head (a22d18a). Report is 51 commits behind head on master.

Files	Patch %	Lines
soccerdata/sofascore.py	95.50%	2 Missing and 2 partials :warning:
soccerdata/_common.py	50.00%	1 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #505 +/- ## ========================================== + Coverage 59.33% 65.15% +5.81% ========================================== Files 11 13 +2 Lines 1633 2003 +370 Branches 336 399 +63 ========================================== + Hits 969 1305 +336 - Misses 610 631 +21 - Partials 54 67 +13 ```

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[ksbharaj]

Hi. Please let me know if there's anything else required to merge this PR. I've edited the docs too. Awaiting feedback and/or approval, and I can add more features. Also, let me know if anything else needs to be added or done differently. Thanks!

[ksbharaj]

Thank you for reviewing! I'll look to get these addressed asap (next couple of days at most)

[probberechts]

Could you fix the merge conflicts, please? The tests currently fail due to an issue with pipx installs in GHA but I've just fixed this in the master branch.