Remove the cached provider functionality

[loevgaard]

Fixes https://github.com/Setono/SyliusPickupPointPlugin/issues/76

This functionality is only used when a user goes the shipping page then goes to some other page and ends up on the shipping page again. I reckon all this complexity is not necessary for such a small case.

Wdyt @vvasiloi?

[codecov[bot]]

Codecov Report

Base: 14.55% // Head: 14.37% // Decreases project coverage by -0.17% :warning:

Coverage data is based on head (9de6028) compared to base (43146ee). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x      #99      +/-   ##
============================================
- Coverage     14.55%   14.37%   -0.18%     
+ Complexity      241      223      -18     
============================================
  Files            37       36       -1     
  Lines           852      765      -87     
============================================
- Hits            124      110      -14     
+ Misses          728      655      -73     

Impacted Files	Coverage Δ
...ndencyInjection/Compiler/RegisterProvidersPass.php	0.00% <ø> (ø)
src/DependencyInjection/Configuration.php	100.00% <ø> (ø)
...encyInjection/SetonoSyliusPickupPointExtension.php	50.00% <ø> (+3.12%)	:arrow_up:

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