Add header_tooltips parameter to Tabulator

[hoxbro]

Fixes #4138

First, by adding the header_tooltip parameter. Secondly, by not overwriting an users column configuration.

import pandas as pd
import panel as pn

pn.extension("tabulator")
df = pd.DataFrame({"int": [1, 2, 3], "header": [True, False, True]})
tabulator = pn.widgets.Tabulator(df, header_tooltips={"header": "Test"}).servable()
tabulator = pn.widgets.Tabulator(df, configuration={"columns": [{"field": "header", "headerTooltip": True}]}).servable()

To do:

• Add unit test for not overwriting users column configuration
• Add UI test for header tooltip
• Update notebook

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.24%. Comparing base (2283d14) to head (5c9be17).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/tests/ui/widgets/test_tabulator.py	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7241      +/-   ##
==========================================
+ Coverage   82.22%   82.24%   +0.01%     
==========================================
  Files         337      337              
  Lines       50228    50251      +23     
==========================================
+ Hits        41302    41327      +25     
+ Misses       8926     8924       -2     

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[philippjfr]

Was this actually needed, expect should wait.

[hoxbro]

It is for the hover part not the expect part. The mouse is moved to the header with hover.