Add reverse charge status to stores

[fthobe]

Concerns (but doesn't solve): #6112 #6110

Summary

This is the first in a series of PRs to achieve fiscal compliance with EU regulation on Solidus easier.
This dropdown, which will also be introduced on Addresses in the future allows to set a Store as reverse charge compliant, allowing to decide on a per store front level if reverse charge can be applied.

This can be especially useful if driving different stores with different legal entities.

Checklist

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• I agree that my PR will be published under the same license as Solidus.
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[fthobe]

@shahmayur001 We need to add the OpenAPI docs for this one.

[fthobe]

@kennyadsl should be ok, only test failing is store credit being flaky on admin

[fthobe]

@tvdeyen @kennyadsl Failing test doesn't seem to be related, can we merge this? It's a preparatory step for fixing the vat discussion and allows to either manually or via API determine reverse charge status when we also integrate the organisation fields from PR #6113 down the road.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.61%. Comparing base (dfe87ae) to head (3351a85).
Report is 124 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6136      +/-   ##
==========================================
- Coverage   88.67%   86.61%   -2.07%     
==========================================
  Files         829      511     -318     
  Lines       17995    11802    -6193     
==========================================
- Hits        15957    10222    -5735     
+ Misses       2038     1580     -458     

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[tvdeyen]

Thanks!

[fthobe]

@jarednorman @tvdeyen I inform you once more that even approved this is only a partial fix and a solution needs to be found

• to handle taxed and untaxed prices for reverse charge

[tvdeyen]

to handle taxed and untaxed prices

This is a very broad statement. Solidus handles taxed and untaxed prices very well.

[fthobe]

#6169

[fthobe]

#6168