CLN: Remove SparseList from pandas API

[gfyoung]

Deprecated in 0.19.0.

xref #14007.

[codecov]

Codecov Report

Merging #18621 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18621      +/-   ##
==========================================
- Coverage   91.46%   91.44%   -0.03%     
==========================================
  Files         157      156       -1     
  Lines       51449    51375      -74     
==========================================
- Hits        47060    46979      -81     
- Misses       4389     4396       +7

Flag	Coverage Δ
#multiple	89.31% <ø> (-0.02%)	⬇️
#single	40.61% <ø> (-0.1%)	⬇️

Impacted Files	Coverage Δ
pandas/core/sparse/api.py	100% <ø> (ø)	⬆️
pandas/util/testing.py	82.11% <ø> (-0.07%)	⬇️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️

---

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[codecov]

Codecov Report

Merging #18621 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18621      +/-   ##
==========================================
- Coverage   91.46%   91.44%   -0.03%     
==========================================
  Files         157      156       -1     
  Lines       51449    51375      -74     
==========================================
- Hits        47060    46979      -81     
- Misses       4389     4396       +7

Flag	Coverage Δ
#multiple	89.31% <ø> (-0.02%)	⬇️
#single	40.61% <ø> (-0.1%)	⬇️

Impacted Files	Coverage Δ
pandas/core/sparse/api.py	100% <ø> (ø)	⬆️
pandas/util/testing.py	82.11% <ø> (-0.07%)	⬇️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️

---

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 6e56195...c3068b3. Read the comment docs.

[jreback]

thanks!