Add support for record id of bytes type

[lmores]

Add support for id columns of type bytes.

Reason: when the primary key of a row is the output of a hashing function, the most natural data type used for the corresponding database column is simply raw bytes (e.g., the BYTEA data type in postgreSQL).

I have already successfully used this patched version of dedupe to deduplicate rows from a postgresSQL table having the primary column of type BYTEA.

Let me know if:

1. you are interested in adding support for id columns with bytes type
2. you prefer to keep this change under the hood (as it is now) or make it explicit and update all the typing definitions in _typing.py

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.65%. Comparing base (f72d4a1) to head (68aa7d7).
⚠️ Report is 60 commits behind head on main.

Files with missing lines	Patch %	Lines
dedupe/core.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1152      +/-   ##
==========================================
- Coverage   73.71%   73.65%   -0.07%     
==========================================
  Files          29       29              
  Lines        2321     2323       +2     
==========================================
  Hits         1711     1711              
- Misses        610      612       +2     

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[lmores]

@fgregg: any thoughts on this?