[Dev] Add the supports_pushdown_type to disable pushing down _row_id filters

[Tishj]

This PR is a follow up to #745

[Tishj]

INTERNAL Error: Assertion triggered in file "/Users/thijs/DuckDBLabs/duckdb_iceberg/duckdb/src/execution/expression_executor.cpp" on line 123: result.GetType().id() == expressions[expr_idx]->return_type.id()

It's broken, and likely requires fixes in core..
This error comes from this mismatch:

input:

(lldb) p input_chunk.Print()
Chunk - [4 Columns]
- FLAT BIGINT: 2 = [ NULL, NULL]
- FLAT BIGINT: 2 = [ 0, 1]
- FLAT INTEGER: 2 = [ 2, 6]
- DICTIONARY VARCHAR: 2 = [ replaced_again, replaced_again]

output:

(lldb) p output_chunk.data[0].GetType().ToString()
(std::string) "INTEGER"
(lldb) p output_chunk.data[1].GetType().ToString()
(std::string) "VARCHAR"
(lldb) p output_chunk.data[2].GetType().ToString()
(std::string) "BIGINT"

expressions:

(lldb) p executor.expressions[0]->ToString()
(std::string) "COALESCE(#0, (0 + #1))"
(lldb) p executor.expressions[1]->ToString()
(std::string) "#2"
(lldb) p executor.expressions[2]->ToString()
(std::string) "#3"

For whatever reason it's placing the expression for the _row_id at the start, not at the end, where the vector is placed