fix(datastore): Regression bug caused by changing the public enum value

[royjit]

Issue: #882
Description of changes: Regression bug caused by changing the public enum value

• Added static functions inside enum to match the previous enum cases to make it backward compatible.
• Unit tests for the changes.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[palpatim]

minor style updates, otherwise LGTM

[codecov]

Codecov Report

Merging #883 (b98dc7f) into main (85a8870) will increase coverage by 0.11%.
The diff coverage is 67.96%.

@@            Coverage Diff             @@
##             main     #883      +/-   ##
==========================================
+ Coverage   64.80%   64.91%   +0.11%     
==========================================
  Files         861      862       +1     
  Lines       34096    34184      +88     
==========================================
+ Hits        22095    22192      +97     
+ Misses      12001    11992       -9     

Flag	Coverage Δ
API_plugin_unit_test	62.56% <ø> (+0.07%)	⬆️
Analytics_plugin_unit_test	72.38% <ø> (ø)
Auth_plugin_unit_test	15.79% <ø> (ø)
DataStore_plugin_unit_test	83.05% <80.00%> (ø)
Predictions_plugin_unit_test	42.11% <ø> (ø)
Storage_plugin_unit_test	74.74% <ø> (ø)
build_test_amplify	64.35% <67.34%> (+0.40%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...DataStore/Model/Internal/Schema/Model+Schema.swift	27.77% <ø> (ø)
.../DataStore/Model/Internal/Schema/ModelSchema.swift	88.23% <ø> (+5.88%)	⬆️
...n/Storage/SQLite/StorageEngineAdapter+SQLite.swift	75.47% <ø> (ø)
...Model/Internal/Schema/ModelField+Association.swift	41.30% <30.00%> (+38.22%)	⬆️
...reCategoryPlugin/Storage/SQLite/Model+SQLite.swift	78.02% <50.00%> (ø)
...Model/Internal/Schema/ModelSchema+Definition.swift	65.51% <72.72%> (+1.23%)	⬆️
...ryTests/DataStore/ModelFieldAssociationTests.swift	85.96% <85.96%> (ø)
...ugin/Storage/SQLite/SQLStatement+CreateTable.swift	91.89% <100.00%> (ø)
...oryPlugin/Storage/SQLite/SQLStatement+Select.swift	95.50% <100.00%> (ø)
...ests/TestSupport/Mocks/TestModelRegistration.swift	96.29% <100.00%> (ø)
... and 6 more

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