[MINOR] Add debug logging to plan teardown

[alamb]

Which issue does this PR close?

Re #3276

Rationale for this change

Implement suggestion from @andygrove on #3276 (comment)

What changes are included in this PR?

Add debug logging messages during plan teardown

Are there any user-facing changes?

no

[codecov-commenter]

Codecov Report

Merging #3350 (0f168d9) into master (7a53872) will decrease coverage by 0.01%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master    #3350      +/-   ##
==========================================
- Coverage   85.46%   85.45%   -0.02%     
==========================================
  Files         294      294              
  Lines       54144    54148       +4     
==========================================
- Hits        46275    46273       -2     
- Misses       7869     7875       +6     

Impacted Files	Coverage Δ
datafusion/core/src/physical_plan/common.rs	75.49% <20.00%> (-2.06%)	⬇️
datafusion/expr/src/logical_plan/plan.rs	77.28% <0.00%> (-0.34%)	⬇️

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[xudong963]

LGTM

[ursabot]

Benchmark runs are scheduled for baseline = eb8c81f and contender = e26452a. e26452a is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java