added custom issue manager class for detecting identifier columns

[MaxJoas]

Summary

🎯 Purpose: This PR solves #923 by adding a issue manager class that find identifier columns

📜 Example Usage:

import numpy as np 
import pandas as pd 
from cleanlab import Datalab
from cleanlab.datalab.internal.issue_manager_factory import register
from cleanlab.datalab.internal.issue_manager.identifier_column import IdentifierColumnIssueManager
register(IdentifierColumnIssueManager)
data = {
    'A': [1, 2, 3, 4, 5],
    'B': [6, 7, 8, 30, 10],
    'C': [2, 12, 13, 14, 15],
    'D': [4, 17, 18, 19, 20],
    'E': [21, 22, 23, 24, 25]
}
df = pd.DataFrame(data)
lab = Datalab(data=df, label_name="D")

lab.find_issues(issue_types={"identifier_column":{"features": df.values}})
lab.info

Impact

No other areas impacted. It is now possible to find a new issue_type.

Screenshots
See code snippetabove

Testing

Ran existing tests, added test_identifier_column.py with last commit.
Tested mainly types sequential and non-sequential arrays (sometimes with and without duplicates and sequences that do not start with 0)

@pytest.mark.parametrize(
    "arr, expected_output",
    [
        (np.array([1, 2, 3, 4, 5]), True),
        (np.array([1, 1, 2, 2, 3, 3, 5]), False),
        (np.array([1, 1, 3, 4, 5, 8, 10]), False),
        (np.array([0, 0, 0, 0, 0, 0, 0]), False),
        (np.array([4, 5, 5, 6, 7, 8, 9, 10]), True),
        (np.array([1, 3, 4, 4, 5, 6, 7, -1]), False),
        (np.array([2, 1, 3, 5, 6, 4]), True),
        (np.array([-1, -3, -2, -4, 0]), True),
        (np.array([]), False),
        (np.array([0, 0, 0]), False),
    ],

Unaddressed Cases
Providing Non-integer and non-numeric columns. I think there will be just an general error fro the issue manager, like with other issues.

Links to Relevant Issues or Conversations

#923
#947

🔗 What Git or Slack items (Issues, threads, etc) that are specifically related to
this work? Please link them here.
None, I know of

References

None

Reviewer Notes

None

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.06%. Comparing base (81af417) to head (b27be24).

❗ Current head b27be24 differs from pull request most recent head 2377fc4. Consider uploading reports for the commit 2377fc4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1120      +/-   ##
==========================================
- Coverage   96.09%   96.06%   -0.03%     
==========================================
  Files          76       77       +1     
  Lines        6088     6128      +40     
  Branches     1081     1089       +8     
==========================================
+ Hits         5850     5887      +37     
- Misses        142      144       +2     
- Partials       96       97       +1     

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