[SPARK-35643][PYTHON] Fix ambiguous reference in functions.py column()
[SPARK-35643][PYTHON] Fix ambiguous reference in functions.py column()

### What changes were proposed in this pull request?
In functions.py, there is a function added `def column(col)`. There is also another method in the same file `def col(col)`. This leads to some ambiguity on whether the parameter is being referred to or the function. In pyspark 3.1.2, this leads to `TypeError: 'str' object is not callable` when the function `column(col)` is called - the highest preference is given to the string variable in scope as opposed to the function `col `in the file as intended.

This PR fixes that ambiguity by changing the variable name to `col_like`. I have filed this as an issue on JIRA here - https://issues.apache.org/jira/browse/SPARK-35643.

### Why are the changes needed?
In pyspark 3.1.2, we see `TypeError: 'str' object is not callable` when `column()` function is called. This Pr fixes that error.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
I don't believe this patch needs additional testing.

Closes #32771 from keerthanvasist/col.

Lead-authored-by: Keerthan Vasist <dc8f66b063a847c9bc6769f800e9c85b483858d0@amazon.com>
Co-authored-by: keerthanvasist <dc8f66b063a847c9bc6769f800e9c85b483858d0@amazon.com>
Co-authored-by: Hyukjin Kwon <2680965ad5aae29275c8fb10150cb10f5554e78b@gmail.com>
Signed-off-by: Hyukjin Kwon <2680965ad5aae29275c8fb10150cb10f5554e78b@apache.org>

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