Make type coercion rule more robust

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Dask SQL project is seeing this:

Skipping optimizer rule TypeCoercion due to unexpected error: Error during planning: Coercion from [Timestamp(Nanosecond, Some("Europe/Berlin"))] to the signature Variadic([Int64]) failed.

Describe the solution you'd like
It would be better for the rule to return the original expression rather than fail

Describe alternatives you've considered
None

Additional context
None

[andygrove]

Also happens in common_sub_expression_eliminate:

Skipping optimizer rule common_sub_expression_eliminate due to unexpected error: Error during planning: 'Timestamp(Nanosecond, None) + Int64' can't be evaluated because there isn't a common type to coerce the types to       

[andygrove]

I think we can close this issue now that there are specific issues filed for optimizer rules that are failing, such as #3797, #3416, #3417, and #3418.