Wrap sync peewee calls in batch loaders

[pylipp]

fragment ProductBasicFields on Product {
  id
  name
  gender
  deletedOn
  __typename
}

fragment SizeBasicFields on Size {
  id
  label
  __typename
}

fragment TagBasicFields on Tag {
  id
  name
  color
  description
  type
  __typename
}

query BoxesForBoxesView($baseId: ID!, $filterInput: FilterBoxInput) {
  boxes(
    baseId: $baseId
    filterInput: $filterInput
    paginationInput: {first: 100000}
  ) {
    totalCount
    pageInfo {
      hasNextPage
      __typename
    }
    elements {
      labelIdentifier
      product {
        ...ProductBasicFields
        __typename
      }
      numberOfItems
      size {
        ...SizeBasicFields
        __typename
      }
      state
      location {
        id
        name
        __typename
      }
      tags {
        ...TagBasicFields
        __typename
      }
      shipmentDetail {
        id
        shipment {
          id
          __typename
        }
        __typename
      }
      comment
      createdOn
      lastModifiedOn
      __typename
    }
    __typename
  }
}

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 84.67%. Comparing base (4150560) to head (da59dfb).

Files	Patch %	Lines
back/boxtribute_server/graph_ql/loaders.py	89.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1222       +/-   ##
===========================================
- Coverage   96.68%   84.67%   -12.02%     
===========================================
  Files         109      231      +122     
  Lines        3497    20869    +17372     
  Branches      343     1569     +1226     
===========================================
+ Hits         3381    17670    +14289     
- Misses         97     3179     +3082     
- Partials       19       20        +1     

Flag	Coverage Δ
backend	96.64% <90.90%> (-0.05%)	⬇️
frontend	82.24% <ø> (?)

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