- Closes apache#17508

The previous implementation used UUID-based aliasing as a workaround to
prevent duplicate names for literals in Substrait plans. This approach
had several drawbacks:
- Non-deterministic plan names that made testing difficult (requiring
UUID regex filters)
- Only addressed literal naming conflicts, not the broader issue of name
deduplication
- Added unnecessary dependency on the `uuid` crate
- Didn't properly handle cases where the same qualified name could
appear with different schema representations

  1. Enhanced NameTracker: Refactored to detect two types of conflicts:
- Duplicate schema names: Tracked via schema_name() to prevent
validate_unique_names failures (e.g., two Utf8(NULL) literals)
- Ambiguous references: Tracked via qualified_name() to prevent
DFSchema::check_names failures when a qualified field (e.g.,
left.Utf8(NULL)) and unqualified field (e.g., Utf8(NULL)) share the same
column name
2. **Removed UUID dependency**: Eliminated the `uuid` crate from
`datafusion/substrait`
3. **Removed literal-specific aliasing**: The UUID-based workaround in
`project_rel.rs` is no longer needed as the improved NameTracker handles
all naming conflicts consistently
4. **Deterministic naming**: Name conflicts now use predictable
`__temp__N` suffixes instead of random UUIDs

Note: This doesn't fully fix all the issues in apache#17508 which allow some
special casing of `CAST` which are not included here.

Yes:
- Updated snapshot tests to reflect the new deterministic naming (e.g.,
`Utf8("people")__temp__0` instead of UUID-based names)
- Modified some roundtrip tests to verify semantic equivalence (schema
matching and execution) rather than exact string matching, which is more
robust
- All existing integration tests pass with the new naming scheme

Minimal. The generated plan names are now deterministic and more
readable (using `__temp__N` suffixes instead of UUIDs), but this is
primarily an internal representation change. The functional behavior and
query results remain unchanged.

(cherry picked from commit d59cdfe)