Allow function reregistration

[nils-braun]

No description provided.

[codecov-commenter]

Codecov Report

Merging #161 (45cc0af) into main (990d647) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #161   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        57           
  Lines         2124      2129    +5     
  Branches       283       284    +1     
=========================================
+ Hits          2124      2129    +5     

Impacted Files	Coverage Δ
dask_sql/context.py	100.00% <100.00%> (ø)
dask_sql/integrations/fugue.py	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 990d647...45cc0af. Read the comment docs.