Add memray profiler

[philippjfr]

Memray will be a nice addition for the profiling functionality in Panel and hopefully let users track down memory leaks more easily.

[codecov]

Codecov Report

Merging #3509 (aa2c8ac) into master (46b8d47) will decrease coverage by 0.13%.
The diff coverage is 10.93%.

@@            Coverage Diff             @@
##           master    #3509      +/-   ##
==========================================
- Coverage   83.57%   83.44%   -0.14%     
==========================================
  Files         214      214              
  Lines       31368    31426      +58     
==========================================
+ Hits        26217    26223       +6     
- Misses       5151     5203      +52     

Flag	Coverage Δ
ui-tests	33.81% <7.81%> (-0.05%)	⬇️
unitexamples-tests	76.37% <10.93%> (-0.14%)	⬇️

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Impacted Files	Coverage Δ
panel/command/serve.py	37.11% <ø> (ø)
panel/config.py	60.22% <ø> (ø)
panel/io/profile.py	19.07% <10.93%> (-4.33%)	⬇️
panel/util.py	86.41% <0.00%> (-0.38%)	⬇️

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