Add an Order eligible total provider to open up for easier overriding

[Roshyo]

No description provided.

[codecov]

Codecov Report

Merging #161 (81b8374) into 0.12.x (c5286ee) will increase coverage by 1.44%.
The diff coverage is 100.00%.

❗ Current head 81b8374 differs from pull request most recent head 6ab7f3c. Consider uploading reports for the commit 6ab7f3c to get more accurate results

@@             Coverage Diff              @@
##             0.12.x     #161      +/-   ##
============================================
+ Coverage     36.33%   37.77%   +1.44%     
- Complexity      445      446       +1     
============================================
  Files            86       87       +1     
  Lines          1445     1448       +3     
============================================
+ Hits            525      547      +22     
+ Misses          920      901      -19     

Impacted Files	Coverage Δ
src/OrderProcessor/OrderGiftCardProcessor.php	86.95% <100.00%> (+86.95%)	⬆️
src/Provider/OrderEligibleTotalProvider.php	100.00% <100.00%> (ø)

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