BUG: Inserting a column into an empty frame results into different dtypes

[dchigarev]

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Reproducible Example

from modin.pandas.test.utils import create_test_dfs

md_df1, pd_df1 = create_test_dfs({"col1": []})

md_df1["new_col"] = [1, 2]
pd_df1["new_col"] = [1, 2]

print(f"modin dtypes:\n{md_df1.dtypes}\n") # {'col1': object, 'new_col': int64}
print(f"pandas dtypes:\n{pd_df1.dtypes}\n") # {'col1': float64, 'new_col': int64}

print(f"modin's insides:\n{md_df1._to_pandas().dtypes}") # {'col1': object, 'new_col': int64}

Issue Description

Dtypes don't match

Expected Behavior

To match pandas

Error Logs

Replace this line with the error backtrace (if applicable).

Installed Versions

Replace this line with the output of pd.show_versions()

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Note: this issue is part of an epic #3804