Bump minimum version of param to 2.0 and add stream transform

[hoxbro]

• Bumps minimum version of param to 2.0
• Remove Panel Widget and replace with param.parameterized.resolve_ref did not work, because resolve_ref returns a list no matter what, and I only want the value parameter.
• Add Pipe and therefore Streams to reactive transform and therefore fixes Buffer does not work as dict argument to Dynamic Map #6229

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 88.19%. Comparing base (d338915) to head (b76ee02).

Files	Patch %	Lines
holoviews/streams.py	85.71%	1 Missing ⚠️
holoviews/util/__init__.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6230   +/-   ##
=======================================
  Coverage   88.18%   88.19%           
=======================================
  Files         321      321           
  Lines       67360    67344   -16     
=======================================
- Hits        59402    59391   -11     
+ Misses       7958     7953    -5     

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[philippjfr]

Looks good!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.