Chore!!: Migrate sqlglot to v30

[VaggelisD]

Summary of Changes

File	Change	Why
pyproject.toml	sqlglot[rs]~=28.10.1 → sqlglot~=30.0.1	Version bump; [rs] extra removed (replaced by sqlglotc)
60+ files across sqlmesh/, tests/, web/	exp.Expression → exp.Expr in all type hints, isinstance checks, and type casts. Class definitions remain as exp.Expression subclasses	sqlglot v30 introduced exp.Expr as the new base class; Expression is now a subclass. Functions like exp.alias_(), exp.func(), parse_one() return Expr, causing mypy errors when assigned to Expression-typed variables. Custom expression classes must still inherit Expression since Expr doesn't support constructor arguments
sqlmesh/core/schema_diff.py, tests/core/integration/utils.py	exp.DataType.Type → exp.DType in type annotations	DataType.Type enum is no longer recognized as a valid type by mypy; exp.DType is the v30 alias
sqlmesh/core/dialect.py	New import path for AthenaTrinoParser, updated self.expression() calls	sqlglot API: Athena parser renamed, expression() now takes pre-constructed objects
sqlmesh/utils/jinja.py	Import Expression from sqlglot.expressions instead of sqlglot	sqlglot.expressions is now a package; top-level re-export changed
sqlmesh/core/model/kind.py	Clear meta["sql"] in _time_data_type_validator	DataType.build now preserves the parsed expression directly. Our _parse_types extension sets meta["sql"], which the pydantic encoder prioritizes over dialect-aware rendering
sqlmesh/core/model/meta.py	Normalize column types through dialect roundtrip during deserialization	BigQuery INT no longer auto-maps to BIGINT during DataType.build; roundtripping through dialect SQL restores canonical form for stable data hashes
sqlmesh/utils/metaprogramming.py	Added _resolve_import_module() to walk module hierarchy for re-exports	to_table.__module__ is now sqlglot.expressions.builders but it's re-exported from sqlglot.expressions; generated import statements must use the public module
sqlmesh/core/context_diff.py	Added sqlglotc to IGNORED_PACKAGES	New sqlglot conditionally imports sqlglotc (C extension); dependency detection was picking it up as a user requirement
tests/core/test_macros.py	Simplified expected Snowflake ARRAY_GENERATE_RANGE arithmetic	sqlglot now simplifies (DATEDIFF(...) + 1 - 1) + 1 to DATEDIFF(...) + 1
tests/core/test_config.py	Relaxed regex for error message module path	Column class now reports __module__ as sqlglot.expressions.core instead of sqlglot.expressions

[VaggelisD]

The DuckDB test failure is preexisting