Data pack attribute interface implementation

[J007X]

This PR fixes #924.

Description of changes

Implemented changes as designed/discussed in #924.

Possible influences of this PR.

Provide a Data Pack level attribute interface, based on lower level interface implemented in #921

Test Conducted

Unit tests, and profiling test for typical scenario.

[codecov]

Codecov Report

Merging #926 (3fe14a9) into master (6e2d6ea) will increase coverage by 0.01%.
The diff coverage is 83.80%.

❗ Current head 3fe14a9 differs from pull request most recent head 07109cc. Consider uploading reports for the commit 07109cc to get more accurate results

@@            Coverage Diff             @@
##           master     #926      +/-   ##
==========================================
+ Coverage   81.05%   81.07%   +0.01%     
==========================================
  Files         256      256              
  Lines       19851    19954     +103     
==========================================
+ Hits        16091    16178      +87     
- Misses       3760     3776      +16     

Impacted Files	Coverage Δ
forte/data/data_store.py	91.59% <75.36%> (-1.72%)	⬇️
forte/data/ontology/ontology_code_generator.py	89.75% <100.00%> (ø)
tests/forte/data/data_store_test.py	95.96% <100.00%> (+0.38%)	⬆️

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