Display value for player

[ahuang11]

Closes #229

Wrapping up the work @benbarn313 did on #6059 by adding support for DiscretePlayer and rename value_location to value_align to have some parallelism with Panel param align a little more

import panel as pn

pn.extension()
pn.widgets.DiscretePlayer(name="Name", show_value=True, value_align="start", value=1, options=[1, 4, 8]).show()

Screen.Recording.2024-08-02.at.12.53.14.PM.mov

import panel as pn

pn.extension()
pn.widgets.DiscretePlayer(
    name="Name", show_value=True, value_align="start", value=1, options=["a", "b", "d"]
).show()

Screen.Recording.2024-08-02.at.12.57.16.PM.mov

[codecov]

Codecov Report

Attention: Patch coverage is 85.41667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 82.21%. Comparing base (071f51a) to head (e1bd9db).
Report is 9 commits behind head on main.

Files	Patch %	Lines
panel/tests/ui/widgets/test_player.py	80.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7060      +/-   ##
==========================================
- Coverage   82.23%   82.21%   -0.02%     
==========================================
  Files         326      327       +1     
  Lines       48394    48509     +115     
==========================================
+ Hits        39796    39882      +86     
- Misses       8598     8627      +29     

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