Adding new optional parameter repeat_headings for FPDF.table()

[Lucas-C]

Requested in #1151

Checklist:

• The GitHub pipeline is OK (green),
  meaning that both pylint (static code analyzer) and black (code formatter) are happy with the changes of this PR.

• A unit test is covering the code added / modified by this PR

• This PR is ready to be merged

• In case of a new feature, docstrings have been added, with also some documentation in the docs/ folder

• A mention of the change is present in CHANGELOG.md

By submitting this pull request, I confirm that my contribution is made under the terms of the GNU LGPL 3.0 license.

[Lucas-C]

Note: the pipeline is failing for now because CodeCov is KO: https://status.codecov.com/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.26%. Comparing base (a313586) to head (b519614).
Report is 6 commits behind head on master.

❗ Current head b519614 differs from pull request most recent head 96dbf9b. Consider uploading reports for the commit 96dbf9b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1153      +/-   ##
==========================================
- Coverage   93.27%   93.26%   -0.01%     
==========================================
  Files          30       30              
  Lines        9228     9246      +18     
  Branches     2103     2104       +1     
==========================================
+ Hits         8607     8623      +16     
- Misses        379      383       +4     
+ Partials      242      240       -2     

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[Lucas-C]

I switched to using an enum value.