fix(ci): download arch-specific DuckDB macOS builds - #139

2.0.0 removed libduckdb-*.zip (and latest now resolves to 2.0.0,
breaking every download with 404). Use the renamed
duckdb-shared-libs-<os>-<arch>.tar.gz, pinned to v2.0.0.

2.0.0 also dropped the amalgamated duckdb.hpp from release assets,
so fetch the C++ headers from a sparse source checkout at the same
tag (verified the C headers there are byte-identical to the tarball
ones) and install the same file set as before: duckdb*.h,
duckdb.hpp, duckdb/ tree, and the shared lib.

2.0.0 removed MaterializedQueryResult; Connection::Query now returns
unique_ptr<QueryResult>, a forward-only stream. Replace indexed
GetValue(col, row) access with chunk Fetch() / row iterators, fetch
the first chunk once and thread it through the placeholder-schema
check (fetching consumes the stream), and convert the now
vector<Identifier> names to strings via GetIdentifierName().

names/types are now private on QueryResult: use GetNames()/GetTypes().
Vector::GetData() is gone: use FlatVector::GetData[Mutable]. The
deprecated ListVector::GetEntry would trip -Werror: use GetChildMutable.
Add the now-required list_vector.hpp/struct_vector.hpp includes.

…ug checkout

GetEntries now returns vector<Vector> (was pointer elements): drop the
dereferences.

Temporarily check out ladybug at the DuckDB-2.0.0 PR branch, which
carries the AttachedDatabase::executeQuery base-class fix this build
needs. Revert to the default branch once that PR merges.

names/types are private on QueryResult: use ColumnCount()/GetTypes(),
and convert Identifier to string explicitly via GetIdentifierName().

names/types are private on QueryResult: use GetTypes()/GetNames() and
convert Identifier explicitly via GetIdentifierName().

The templated GetDataMutable<T> validates T against DuckDB's own
types and throws for ladybug-side types (e.g. interval_t/string_t).
Use the untyped accessors plus casts exactly like the old GetData()
member did.

2.0.0 executes the inner postgres_query statement at bind time, so DDL
and DML no longer fail with 'No fields returned' but run (or fail
confusingly, e.g. read-only errors) during planning. Validate that the
inner query is a plain SELECT up front via ExtractStatements. 2.0.0
also stopped rejecting duplicate output column names, so enforce the
historical contract in bind.

Update remote attach-not-exist expectations to the 2.0.0 httpfs error
messages.

sql_query DDL rejection now comes from ladybug's binder ('Binder
exception:') instead of DuckDB; duplicate output columns are
auto-renamed (name_1) instead of rejected, so assert the new
successful shape. Remote-attach failures now surface raw httpfs
errors; match them without regex paren escapes.

PG numeric-to-hugeint conversion rounds differently in 2.0.0
(closer to the true value); update the movies hugedata expectation.
The S3 missing-file error now carries trailing hint text, so allow
trailing content in the match.