fix: problem with the load_table method

[kmkoshy]

Description

Please provide a brief description of the changes made in this pull request.
mapdl behavior of *TREAD when column number is more than 2 is that it takes the first row as column header.

There are two possible scenarios :

1. Where the column header is defined in the text file. (Problem with the load_table method. #3305)
2. Where the column header is not defined. (we currently handle it internally in pymapdl copying the first row again).

fix attempted by introducing a keyword arg col_header to handle case with col_header.
when col_header=True do not go through the logic of copying the first row again. (which is why we see the issue in 3305).
update dim accordingly.

from #3305 updating the load_table cmd with the keyword arg col_header:True should fix the issue.
mapdl.load_table('acc_data', acceleration_data, 'time',col_header=True)

Issue linked

Please mention the issue number or describe the problem this pull request addresses.
#3305

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.25%. Comparing base (b39d487) to head (9ea8312).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3745      +/-   ##
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- Coverage   88.27%   88.25%   -0.03%     
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  Files         187      187              
  Lines       14705    14708       +3     
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- Hits        12981    12980       -1     
- Misses       1724     1728       +4     

[germa89]

thank you @kmkoshy a lot for doing this PR. I really appreciate the time you took for this.

Overall it is great, good docs, good tests,... no big suggestions. Just styling changes.

(By the way, I did add some tests which do not add anything on top your PR, but I did them for myself to understand how the tables works, so I thought it will be good idea to include them in the test set)

Again, great work. Thank you a lot!

[kmkoshy]

Thank you @germa89 for the review and suggestion.