ICU BindAdapterData::Equals is missing

[hawkfish]

What happens?

When multiple ICU date part functions are invoked, the first one is executed for all of them

To Reproduce

require icu

SELECT MAX(EXTRACT(YEAR FROM ts))
	, MAX(EXTRACT(MONTH FROM ts))
	, MAX(EXTRACT(DAY FROM ts))
	, MAX(EXTRACT(DECADE FROM ts))
	, MAX(EXTRACT(CENTURY FROM ts))
FROM (SELECT '2021-12-22'::TIMESTAMPTZ) tbl(d);

This is because BoundFunctionExpression::Equals relies on comparing the FunctionData when the function itself is the same.

Environment (please complete the following information):

• OS: OSX
• DuckDB Version: 0.3.2 HEAD
• DuckDB Client: Test Harness

Before Submitting

• [X ] Have you tried this on the latest master branch?

• Python: pip install duckdb --upgrade --pre
• R: install.packages("https://github.com/duckdb/duckdb/releases/download/master-builds/duckdb_r_src.tar.gz", repos = NULL)
• Other Platforms: You can find binaries here or compile from source.

• [X ] Have you tried the steps to reproduce? Do they include all relevant data and configuration? Does the issue you report still appear there?