MultiPack to SinglePack boxer

[VincentYaoMBZUAI]

This PR fixes #561

Description of changes

This PR creates a new class "DataPackBoxer" to cast a DataPack from a MultiPack, where the DataPack is the only content of the original MultiPack, indexed by the attributepack_name. It would be able to auto-box the multi-pack into a data-pack by simple 'getting pack' and returning an iterator that produces the boxed data-pack.

Possible influences of this PR.

Forte already has a MultiPackBoxer that can cast DataPack into MultiPack. The PR will be able to add a new caster that can perform the opposite conversion, casting MultiPack to DataPack.

Test Conducted

A test case "test_datapack_boxer()" is designed and added in "data_type_infer_test.py", which can be used to test the caster by checking the output_pack_type is DataPack while input_pack_type is MultiPack.

[codecov]

Codecov Report

Merging #564 (bbc763b) into master (4bb8fa5) will increase coverage by 0.05%.
The diff coverage is 96.49%.

@@            Coverage Diff             @@
##           master     #564      +/-   ##
==========================================
+ Coverage   80.62%   80.68%   +0.05%     
==========================================
  Files         237      238       +1     
  Lines       16930    16986      +56     
==========================================
+ Hits        13650    13705      +55     
- Misses       3280     3281       +1     

Impacted Files	Coverage Δ
forte/data/base_pack.py	77.77% <ø> (ø)
forte/data/caster.py	91.66% <93.33%> (+0.75%)	⬆️
tests/forte/datapack_boxer_test.py	97.22% <97.22%> (ø)
tests/forte/data/datapack_type_infer_test.py	100.00% <100.00%> (ø)
forte/data/multi_pack.py	78.54% <0.00%> (+0.42%)	⬆️

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[hunterhector]

the PR message need to be updated as the following:

This PR fixes [https://github.com/asyml/forte/issues/561].

This PR fixes https://github.com/asyml/forte/issues/561.

[hunterhector]

The correct way to write the PR message is as follow:

This PR fixes https://github.com/asyml/forte/issues/561

You need to remove the square brackets

[hunterhector]

I think we can reuse the current dataset without adding a new file

[hunterhector]

we should remove this file if it is no longer needed

[hunterhector]

overall looks fine to me, I think we just need to remove the redundant file and fix the CI to merge this.

[hunterhector]

btw, besides removing the redundant ontonotes/00_1, we should also update the branch to make it up to date.