Allow DynamoQuery usage with no DataTable

[vemel]

Notes

The idea is to use DataTable explicitly only on DynamoTable level, but not on DyanmoQuery

Public API changes

Added

• DataTable.copy method

Changed

• DataTable.keys returns an iterator (not compatible with a regular dict)
• DataTable.values returns an iterator (not compatible with a regular dict)
• DataTable.items returns an iterator (not compatible with a regular dict)
• DataTable.__iter__ iterates over records (used to be keys) and fails for non-normalized tables
• DynamoQuery.execute_dict method's data argument made optional
• DynamoQuery.execute method's data_table argument accepts Iterable[Dict] a well as a DataTable

Fixed

• Typing for subclassed DataTable

[codecov]

Codecov Report

Merging #31 into master will decrease coverage by 0.02%.
The diff coverage is 97.56%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   95.34%   95.31%   -0.03%     
==========================================
  Files          13       13              
  Lines        1567     1581      +14     
==========================================
+ Hits         1494     1507      +13     
- Misses         73       74       +1     

Impacted Files	Coverage Δ
dynamo_query/data_table.py	99.44% <96.55%> (-0.56%)	⬇️
dynamo_query/base_dynamo_query.py	100.00% <100.00%> (ø)
dynamo_query/dynamo_query_main.py	100.00% <100.00%> (ø)

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