Add Class Level, UnitNumber, and link PostalCode and Street to Seller

[felixchanyy]

Fixes inconsistency in Seller class attributes by introducing Level and
UnitNumber. Connect PostalCode and Street attributes to Seller
class for comprehensive address representation.

This change ensures that all necessary address-related
attributes are present in the Seller class, enhancing the
completeness and accuracy of seller information.

The decision to link PostalCode and Street directly to the
Seller class is made to streamline the representation of a
seller's address. By including these attributes within the Seller class,
we create a more cohesive and organized data structure, simplifying
access and manipulation of seller information.

No further relevant information at this time.

[zengzihui]

LGTM

[redcolorbicycle]

lgtm 😩

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.51%. Comparing base (96d24f1) to head (35a4882).
Report is 58 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #71   +/-   ##
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  Coverage     70.51%   70.51%           
  Complexity      482      482           
=========================================
  Files            87       87           
  Lines          1662     1662           
  Branches        160      160           
=========================================
  Hits           1172     1172           
  Misses          443      443           
  Partials         47       47           

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