CLN: compat.to_str -> core.dtypes.common.ensure_str

[topper-123]

compat.to_str is useful to have in cases where an object might be a bytes object, so it's moved to core.dtypes.common and renamed to ensure_str.

[codecov]

Codecov Report

Merging #26811 into master will decrease coverage by 50.57%.
The diff coverage is 30.76%.

@@             Coverage Diff             @@
##           master   #26811       +/-   ##
===========================================
- Coverage   91.76%   41.19%   -50.58%     
===========================================
  Files         178      178               
  Lines       50751    50749        -2     
===========================================
- Hits        46574    20907    -25667     
- Misses       4177    29842    +25665

Flag	Coverage Δ
#multiple	?
#single	41.19% <30.76%> (-0.12%)	⬇️

Impacted Files	Coverage Δ
pandas/compat/__init__.py	92% <ø> (-1.55%)	⬇️
pandas/core/dtypes/cast.py	48.5% <0%> (-42.05%)	⬇️
pandas/core/dtypes/common.py	68.99% <28.57%> (-27.29%)	⬇️
pandas/core/generic.py	38.33% <33.33%> (-55.78%)	⬇️
pandas/io/json/json.py	61.91% <50%> (-31.33%)	⬇️
pandas/io/formats/latex.py	0% <0%> (-100%)	⬇️
pandas/plotting/_matplotlib/__init__.py	0% <0%> (-100%)	⬇️
pandas/io/sas/sas_constants.py	0% <0%> (-100%)	⬇️
pandas/core/groupby/categorical.py	0% <0%> (-100%)	⬇️
pandas/tseries/plotting.py	0% <0%> (-100%)	⬇️
... and 136 more

---

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[codecov]

Codecov Report

Merging #26811 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #26811      +/-   ##
==========================================
- Coverage   91.76%   91.75%   -0.02%     
==========================================
  Files         178      178              
  Lines       50751    50749       -2     
==========================================
- Hits        46574    46567       -7     
- Misses       4177     4182       +5

Flag	Coverage Δ
#multiple	90.35% <100%> (-0.01%)	⬇️
#single	41.2% <30.76%> (-0.11%)	⬇️

Impacted Files	Coverage Δ
pandas/compat/__init__.py	92% <ø> (-1.55%)	⬇️
pandas/io/json/json.py	93.22% <100%> (-0.02%)	⬇️
pandas/core/dtypes/cast.py	90.53% <100%> (-0.02%)	⬇️
pandas/core/dtypes/common.py	96.35% <100%> (+0.06%)	⬆️
pandas/core/generic.py	94.1% <100%> (ø)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	96.88% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.84% <0%> (-0.11%)	⬇️

---

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[jreback]

lgtm. merge on green.