Promotion re-evaluation for line_item CRUD

[arjun289]

Why?

If an order has promotion applied to it, then if any of the line items
are touched(updated, removed) or a new line item is added, promotion
associated with it needs to be re-evaluated so that right adjustments
are present for the order.

This change addresses the need by:

This change

• Adds a module to handle promotion re-evaluation whenever line items
  of an order are added, removed or updated.
• The ineligible adjustments for an order are now removed so that
  only eligible adjustments are present.
  [delivers #163001984]

Checklist

• I have read CONTRIBUTING.md.
• My code follows the style guidelines of this project.
• I have commented my code, particularly in hard-to-understand areas.
• My code does not generate any (new) credo and compile-time warnings.
• I have updated the documentation wherever necessary.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #478 into develop will increase coverage by 0.54%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #478      +/-   ##
===========================================
+ Coverage    79.87%   80.41%   +0.54%     
===========================================
  Files          176      177       +1     
  Lines         2216     2242      +26     
===========================================
+ Hits          1770     1803      +33     
+ Misses         446      439       -7

Impacted Files	Coverage Δ
...lib/core/data/model/promotion/order_eligibility.ex	100% <ø> (ø)	⬆️
apps/snitch_core/lib/core/data/model/order.ex	73.68% <ø> (+15.78%)	⬆️
apps/snitch_core/lib/core/data/model/line_item.ex	87.5% <ø> (ø)	⬆️
apps/snitch_core/lib/core/domain/promotion/cart.ex	100% <100%> (ø)
...core/data/model/adjustment/promotion_adjustment.ex	97.82% <100%> (+0.04%)	⬆️
...ch_core/lib/core/data/model/promotion/promotion.ex	90.47% <100%> (+7.54%)	⬆️
..._core/lib/core/data/model/general_configuration.ex	63.63% <0%> (-9.1%)	⬇️
apps/snitch_core/lib/core/data/schema/order.ex	100% <0%> (+13.33%)	⬆️

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