Swipe layout - possible improvements: add aligned well positioned, formattable before and after titles, ability to constrain the swipe line by frame, etc.

[GeoVizNow]

This enhancement proposal is to participate in making the really great swipe layout tool even more clear and useful.
I can almost not wait starting using it:).

Is your feature request related to a problem? Please describe.

I would like if there is an option to add a title belonging to each of the '_before' and '_after' objects.
The titles should be aligned or otherwise clearly indicate which object they belong to. I think @MarcSkovMadsen had some possible examples of this in #3007 Adds Swipe layout

Describe the solution you'd like

I would like to be able to add a title to both '_before' and '_after' such that it e.g. is stating:

### Imports
import holoviews as hv
import panel as pn
import xarray as xr
import hvplot.xarray
pn.extension(sizing_mode='stretch_width')

# Example data code taken from https://hvplot.holoviz.org/reference/xarray/image.html
ds = xr.tutorial.open_dataset('air_temperature')

# time = '2014-01-01'
data_2013_01 = ds.sel(time='2013-01-01').mean('time') - 273  # convert to celcius
data_2014_01 = ds.sel(time='2014-01-01').mean('time') - 273  # convert to celcius

# example using swipe
img_opts = dict(cmap='gray', frame_height=400, frame_width=400) # , coastline=True)
title_before = 'Jan 2013'
title_after = 'Jan 2014'
swipe_layout = pn.layout.Swipe(
    data_2013_01.hvplot.image(title='2013', **img_opts),
    data_2014_01.hvplot.image(title='2014', **img_opts),
    value=10,
    slider_color='white'
)
pn.Column(
    pn.Row(
        pn.pane.Markdown(f'**Before**: {title_before}', align='start'), 
        pn.pane.Markdown(f'**After**: {title_after}', align='end')
    ),
    swipe_layout
)

Example animation from the code:

Describe alternatives you've considered

Above I manually create the before and after titles, but would be more convenient to add as arguments to panel.layout.swipe.

Additional context

Some more thoughts includes:

• protecting hover tooltips from being clipped by the swipe line
• ability to optionally let the swipe line follow the frame limits when both the before or after objects are same sized holoviews objects.
• ability to show the zoom rectangle stipled black rectangle on both sides of the swipe line.
• on menion more is that I have seen implementations where one could choose either horisontal or vertical swipe line. Maybe a thought for far future.