[ENH] remove select_columns from conditional_join

[samukweku]

PR Description

Please describe the changes proposed in the pull request:

• remove deprecated select_columns function from other functions/tests
• use align instead of merge for left/right join
• add support for timedelta dtype

This PR builds on #1288 .

PR Checklist

Please ensure that you have done the following:

1. PR in from a fork off your branch. Do not PR from <your_username>:dev, but rather from <your_username>:<feature-branch_name>.

2. If you're not on the contributors list, add yourself to AUTHORS.md.

3. Add a line to CHANGELOG.md under the latest version header (i.e. the one that is "on deck") describing the contribution.
   • Do use some discretion here; if there are multiple PRs that are related, keep them in a single line.

Automatic checks

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• Building a preview of the docs on Netlify
• Automatically linting the code
• Making sure the code is documented
• Making sure that all tests are passed
• Making sure that code coverage doesn't go down.

Relevant Reviewers

Please tag maintainers to review.

• @ericmjl

[ericmjl]

🚀 Deployed on https://deploy-preview-1297--pyjanitor.netlify.app

[codecov]

Codecov Report

Merging #1297 (5d6ad68) into dev (a4f1c0a) will increase coverage by 1.45%.
Report is 4 commits behind head on dev.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1297      +/-   ##
==========================================
+ Coverage   92.84%   94.30%   +1.45%     
==========================================
  Files          78       78              
  Lines        4125     4142      +17     
==========================================
+ Hits         3830     3906      +76     
+ Misses        295      236      -59     

[ericmjl]

GitBot Summary of Changes

The pull request includes several changes across multiple files, primarily focusing on enhancing the conditional_join function and updating the select function usage:

1. In CHANGELOG.md, a new enhancement is added to the list, stating that conditional_join now supports timedelta dtype.

2. In conditional_join.py, the conditional_join function is updated to support timedelta dtype. The function now supports efficient joins on inequality operators. The function's documentation is updated to reflect these changes. Several examples are added to illustrate the new functionality.

3. In deconcatenate_column.py, impute.py, move.py, pivot.py, utils.py, io.py, and test_clean_names.py, the usage of select_columns is replaced with select.

4. In test_conditional_join.py, new test cases are added to verify the correct behavior of the updated conditional_join function.

5. In xlsx_cells function in io.py, the usage of select_columns is replaced with select.

6. In test_clean_names.py, the usage of select_columns is replaced with select in the test cases.

7. In test_conditional_join.py, new test cases are added to verify the correct behavior of the updated conditional_join function, especially with the new support for timedelta dtype.

cc: @samukweku, please check for correctness!

[ericmjl]

@samukweku I think we're good to merge, right? I've already approved the changes, and all tests pass so far.

[samukweku]

@ericmjl yes it is ok to merge. Thanks