Add alphabetical and custom sort to Param

[MarcSkovMadsen]

Addresses #2985

[MarcSkovMadsen]

Example from issue

Much easier to find something 😄

import panel as pn
import numpy as np
import holoviews as hv

pn.extension(sizing_mode="stretch_width")

template = pn.template.FastListTemplate(
    site="Awesome Panel", title="New Accent Color",
    main=[pn.widgets.Button(name="Click Me", button_type="primary")],
)
pn.Param(template, sorted=True).servable()

[philippjfr]

Looks great, I requested a few changes but overall I'll be very happy with this.

[MarcSkovMadsen]

Thanks for your comments @philippjfr . I've fixed and pushed.

There is one test failure. But I cannot see it should be related to these changes.

Please let know if I should do more. Thanks.

[jbednar]

Very cool, thanks!

[maximlt]

The failed test was due to a corrupted dev release of holoviews (my bad!). This had been fixed very quickly. @MarcSkovMadsen feel free to push an empty commit to rerun the test suite.

[philippjfr]

I've just restarted the test suite.

[codecov]

Codecov Report

Merging #2986 (d87cb73) into master (09bab95) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2986      +/-   ##
==========================================
+ Coverage   83.25%   83.27%   +0.02%     
==========================================
  Files         190      190              
  Lines       24971    25001      +30     
==========================================
+ Hits        20789    20819      +30     
  Misses       4182     4182              

Impacted Files	Coverage Δ
panel/param.py	87.01% <100.00%> (+0.17%)	⬆️
panel/tests/test_param.py	99.88% <100.00%> (+<0.01%)	⬆️

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[maximlt]

Thanks @philippjfr, I always forget that the CI can be rerun (there should be a more obvious button but maybe that's intentional).