Add required keys to projections

[vemel]

Notes

DynamoTable was raising errors when getting keys for records that contain required fields, becuse it retrieved only pk and sk.

class UserRecord(DynamoDictClass):
   name: str # required field

UserTable[UserRecord]().clear_table() # previously raised an exception

Public API changes

Added

• DynamoDictClass.get_required_field_names method
• DynamoDictClass.get_field_names method

Fixed

• DynamoTable now works with DynamoDictClass with required fields
• DynamoDictClass child class methods were detected as field names
• DynamoDictClass fields are initialized only once per class

[codecov]

Codecov Report

Merging #44 into master will increase coverage by 1.25%.
The diff coverage is 98.07%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   95.13%   96.38%   +1.25%     
==========================================
  Files          16       16              
  Lines        1728     1745      +17     
==========================================
+ Hits         1644     1682      +38     
+ Misses         84       63      -21     

Impacted Files	Coverage Δ
dynamo_query/dynamo_table.py	93.37% <83.33%> (-0.23%)	⬇️
dynamo_query/dictclasses/dictclass.py	96.81% <100.00%> (-0.79%)	⬇️
dynamo_query/dictclasses/dynamo_dictclass.py	100.00% <100.00%> (ø)
dynamo_query/dictclasses/loose_dictclass.py	87.50% <100.00%> (-6.62%)	⬇️
dynamo_query/data_table.py	100.00% <0.00%> (+1.59%)	⬆️
dynamo_query/dynamo_autoscaler.py	39.28% <0.00%> (+39.28%)	⬆️

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