DOBPlugin: Implementation and tests

[vivitsa-s]

1. dialogy/plugins/text/dob_plugin: added plugin
2. tests/plugin/text/test_dob_plugin: added tests and test cases- (data from 27 turns corresponding to 17 calls)
3. pyproject.toml: added the library "word2number"

For more details on 1 and 2, please see: https://www.notion.so/Parser-Wrapper-to-fix-format-issues-00cdba3e731348bd9a9b7b0fd079864a

[janaab11]

@vivitsa-s didn't the poetry.lock file also change when adding a new package?

[janaab11]

@prashantskit can you review the logic, and test cases?

[janaab11]

@vivitsa-s type checks are failing for the dob plugin

[janaab11]

@prashantskit @vivitsa-s unit tests for the DOB plugin are failing. from what i can see, this is because of two things:

1. Duckling responses are not mocked
2. an aggregate metric (~correctness) is used instead of independent assertions

Can we address these two things? Specifically for 2, can we have unit tests that are not dependent on the internal logic of the plugin? Correctness seems like a development metric which should live elsewhere

[codecov-commenter]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (a651397) 88.95% compared to head (0560548) 88.90%.

Files	Patch %	Lines
dialogy/plugins/text/dob_plugin/__init__.py	87.50%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #206      +/-   ##
==========================================
- Coverage   88.95%   88.90%   -0.05%     
==========================================
  Files          61       62       +1     
  Lines        3059     3190     +131     
==========================================
+ Hits         2721     2836     +115     
- Misses        338      354      +16     

Flag	Coverage Δ
unittests	88.90% <87.59%> (-0.05%)	⬇️

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