more direct set up data model, tests passing

[fgregg]

set up data models like

[
  dedupe.variables.String("name"),
  dedupe.variables.Exact("address")
 ]

instead of

[
  {"field", "name", "type": "String"},
  {"field", "address", "type": "String"},
 ]

supersedes #1122, #1121. will close #1085

Todo:

• get tests passing
• update documentation
• update changelog
• update external dedupe variables
• raise helpful message if trying to initialize with a list of dicts
• update example code

This is is going to be a breaking change, so do we want to make bigger changes like splitting datamodel into feature creators and blocking rules, a la #1102?

[codecov]

Codecov Report

Attention: Patch coverage is 85.83333% with 17 lines in your changes missing coverage. Please review.

Project coverage is 74.24%. Comparing base (f7e131e) to head (954b561).
Report is 5 commits behind head on main.

❗ Current head 954b561 differs from pull request most recent head b74cfdb

Please upload reports for the commit b74cfdb to get more accurate results.

Files	Patch %	Lines
dedupe/variables/base.py	80.00%	5 Missing ⚠️
dedupe/variables/set.py	33.33%	4 Missing ⚠️
dedupe/variables/string.py	66.66%	4 Missing ⚠️
dedupe/datamodel.py	94.11%	2 Missing ⚠️
dedupe/variables/exists.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1193      +/-   ##
==========================================
+ Coverage   73.57%   74.24%   +0.67%     
==========================================
  Files          29       29              
  Lines        2293     2221      -72     
==========================================
- Hits         1687     1649      -38     
+ Misses        606      572      -34     

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[fgregg]

I still think @NickCrews's ideas about breaking apart the DataModel object is good, but i think that we should be able to do that in a way that does not break backwards compatibility, so I think we don't need to try to bring it in now.

[NickCrews]

@fgregg dedupe returns from the dead! 😉 Great to see some love happening here, thanks for your work!