Support Perspective Backend

[MarcSkovMadsen]

Closing #7359

Currently this is exploration and analysis

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.21%. Comparing base (5ef8909) to head (91459bf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7368      +/-   ##
==========================================
- Coverage   82.21%   82.21%   -0.01%     
==========================================
  Files         337      337              
  Lines       50513    50513              
==========================================
- Hits        41530    41529       -1     
- Misses       8983     8984       +1     

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[philippjfr]

Also see #2752

[MarcSkovMadsen]

Also see #2752

Having analyzed the problem I think a great solution would be to enable users to specific a named table and a Perspective backend web socket. Then make it really easy to add a Perspective backend web socket to Panel. The question is whether it should be almost hidden or specific via #2752.