Smoothed linear interpolation support

[SouthEndMusic]

See corresponding PR at DataInterpolations here. I added a comment there about whether the information that SparseConnectivityTracer needs for the different interpolation types should live in DataInterpolations

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.57%. Comparing base (577de61) to head (a7618fc).

❗ There is a different number of reports uploaded between BASE (577de61) and HEAD (a7618fc). Click for more details.

HEAD has 10 uploads less than BASE

Flag	BASE (577de61)	HEAD (a7618fc)
	12	2

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #252       +/-   ##
===========================================
- Coverage   92.53%   58.57%   -33.96%     
===========================================
  Files          30       30               
  Lines        1246     1183       -63     
===========================================
- Hits         1153      693      -460     
- Misses         93      490      +397     

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[adrhill]

If you don't mind, it would be better for the DI extension to live in DI at this point.
SCT v0.7.0 is coming up in #254 and would be a nice occasion for the move.