Persist select when pagination=remote

[hoxbro]

TODO:

• I need to handle shift key logic

Example

screenrecord-2023-11-28_18.11.40.mp4

import numpy as np
import pandas as pd
import panel as pn

pn.extension("tabulator")

data = np.arange(20) + 100
df = pd.DataFrame(data)
tab = pn.widgets.Tabulator(
    value=df,
    disabled=True,
    pagination="remote",
    page_size=10,
    header_filters=True,
)
tab.servable()

[codecov]

Codecov Report

Attention: 171 lines in your changes are missing coverage. Please review.

Comparison is base (e3fdd48) 84.15% compared to head (471fa25) 72.04%.
Report is 7 commits behind head on main.

❗ Current head 471fa25 differs from pull request most recent head 078591f. Consider uploading reports for the commit 078591f to get more accurate results

Files	Patch %	Lines
panel/tests/ui/widgets/test_tabulator.py	0.59%	167 Missing ⚠️
panel/widgets/tables.py	57.14%	3 Missing ⚠️
panel/models/tabulator.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5929       +/-   ##
===========================================
- Coverage   84.15%   72.04%   -12.12%     
===========================================
  Files         291      291               
  Lines       42786    43068      +282     
===========================================
- Hits        36007    31027     -4980     
- Misses       6779    12041     +5262     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	72.04% <3.38%> (-0.39%)	⬇️

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[hoxbro]

Shift behavior differs a bit for pagination="local" as it only looks at the current page.

screenrecord-2023-11-29_10.26.45.mp4

[hoxbro]

Also implemented logic if selectable is an integer like selectable=2.

screenrecord-2023-11-29_10.29.27.mp4