Move chat components into its own namespace

[ahuang11]

Closes #5625

It's probably a good idea to move these chat components into its own namespace before release to avoid future deprecations and confusion.

I believe that's everything, but I may be forgetting something so let me know if you think of something that needs to be moved too.

[ahuang11]

Oh I need to actually update the imports.

[ahuang11]

Now that it's in its own namespace, would it make sense to drop the "Chat" prefix from ChatInterface, ChatFeed, ChatEntry, etc so that it's pn.chat.Interface, pn.chat.Feed, and pn.chat.Entry or is that too generic?

[MarcSkovMadsen]

Now that it's in its own namespace, would it make sense to drop the "Chat" prefix from ChatInterface, ChatFeed, ChatEntry, etc so that it's pn.chat.Interface, pn.chat.Feed, and pn.chat.Entry or is that too generic?

I believe that is too generic.

[ahuang11]

Decided to separate each component into its own module since they're all pretty big.

[codecov]

Codecov Report

Merging #5633 (74f34f9) into main (db1e9fe) will decrease coverage by 1.74%.
The diff coverage is 91.23%.

@@            Coverage Diff             @@
##             main    #5633      +/-   ##
==========================================
- Coverage   83.65%   81.91%   -1.74%     
==========================================
  Files         280      288       +8     
  Lines       41580    41678      +98     
==========================================
- Hits        34782    34141     -641     
- Misses       6798     7537     +739     

Flag	Coverage Δ
ui-tests	36.05% <28.09%> (-3.54%)	⬇️
unitexamples-tests	73.71% <91.23%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
panel/__init__.py	100.00% <100.00%> (ø)
panel/chat/__init__.py	100.00% <100.00%> (ø)
panel/tests/chat/test_entry.py	100.00% <100.00%> (ø)
panel/tests/chat/test_feed.py	100.00% <100.00%> (ø)
panel/tests/chat/test_icon.py	100.00% <100.00%> (ø)
panel/tests/chat/test_interface.py	100.00% <100.00%> (ø)
panel/widgets/__init__.py	100.00% <ø> (ø)
panel/chat/icon.py	92.64% <92.64%> (ø)
panel/chat/interface.py	95.45% <95.45%> (ø)
panel/chat/feed.py	95.06% <95.06%> (ø)
... and 3 more

... and 22 files with indirect coverage changes

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