Move Fugue SQL dependencies into functions as soft dependencies

[goodwanghan]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b92be71) 100.00% compared to head (947afe6) 100.00%.

❗ Current head 947afe6 differs from pull request most recent head 4ed02bd. Consider uploading reports for the commit 4ed02bd to get more accurate results

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #481   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          128       128           
  Lines        12009     12036   +27     
=========================================
+ Hits         12009     12036   +27     

Impacted Files	Coverage Δ
fugue/_utils/misc.py	100.00% <100.00%> (ø)
fugue/collections/sql.py	100.00% <100.00%> (ø)
fugue/execution/native_execution_engine.py	100.00% <100.00%> (ø)
fugue/sql/_utils.py	100.00% <100.00%> (ø)
fugue/sql/workflow.py	100.00% <100.00%> (ø)
fugue_dask/_utils.py	100.00% <100.00%> (ø)
fugue_dask/execution_engine.py	100.00% <100.00%> (ø)
fugue_test/builtin_suite.py	100.00% <100.00%> (ø)
fugue_test/execution_suite.py	100.00% <100.00%> (ø)

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