STYLE enable TCH on pandas/core/io (#51770)

* checked 'removed pandas/core/io/* = [TCH]' for errors

* checked 'removed pandas/core/io/* = [TCH]' for errors1

* removed pandas/core/io/* = [TCH]

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Co-authored-by: Marco Edward Gorelli <[email protected]>

Author: potap75

pyproject.toml

@@ -292,7 +292,6 @@ exclude = [
 "asv_bench/*" = ["TID"]
 # TCH to be enabled gradually
 "pandas/core/arrays/*" = ["TCH"]
-"pandas/core/io/*" = ["TCH"]
 "pandas/core/nanops.py" = ["TCH"]
 "pandas/core/apply.py" = ["TCH"]
 "pandas/core/base.py" = ["TCH"]