Implement special command ddp (default privileges)

[mirobertod]

Description

Implement special command ddp (default privileges)

Checklist

• [x] I've added this contribution to the changelog.rst.
• [x] I installed pre-commit hooks (pip install pre-commit && pre-commit install), and ran black on my code.
• [x] Please squash merge this pull request (uncheck if you'd like us to merge as multiple commits)

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@47f613f). Click here to learn what that means. The diff coverage is 13.17%.

@@           Coverage Diff            @@
##             master    #103   +/-   ##
========================================
  Coverage          ?   8.44%           
========================================
  Files             ?       6           
  Lines             ?    2464           
  Branches          ?       0           
========================================
  Hits              ?     208           
  Misses            ?    2256           
  Partials          ?       0           

Impacted Files	Coverage Δ
pgspecial/help/commands.py	0.20% <ø> (ø)
pgspecial/dbcommands.py	2.28% <5.38%> (ø)
pgspecial/iocommands.py	26.44% <37.93%> (ø)
pgspecial/main.py	31.10% <51.11%> (ø)
pgspecial/namedqueries.py	92.00% <75.00%> (ø)
pgspecial/__init__.py	100.00% <100.00%> (ø)

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[j-bennet]

Merged. Thank you!