fix: include casts for numeric Literals except in comparisons

[NickCrews]

Fixes #10890

I only ran this for duckdb locally, I'm curious to see how this does on all the other backends.

This is a bit of a one-off approach to special-case for the predicate pushdown problem described in project/ibis/issues/9662. eg we only make the special case of ops.UntypedNumericLiteral for numbers, but are there other instances where we also want to avoid a cast, so this should be a more general ops.UntypedLiteral?

• Need to verify that the solution keeps the predicate pushdown described in bug(geospatial): casting of literals preventing filter push down to parquet reader #9662
• The other backends tests for test_numeric_literal need to get updated, because now ibis.dtype_from_backend_string(ibis.literal(12.34, <type>).typeof()) == <type> is always true (yay!)

For myself, a few of the common tests to run

• pytest -k numeric_literal -vv ibis/backends/tests/test_numeric.py
• pytest --snapshot-update -vv ibis/backends/tests/sql/test_compiler.py
• pytest --snapshot-update -vv ibis/backends/tests/sql/test_sql.py