Add duckdb_engine and sqlalchemy to build dependencies

Why these changes are being introduced:

Until we update the build approach, possibly when we migrate to uv,
we need to add any dependencies to *both* Pipfile (for local dev)
and pyproject.toml (for building by other applications).

How this addresses that need:
* Adds duckdb_engine and sqlalchemy to pyproject.toml

Relevant ticket(s):
* None

Author: ghukill

Pipfile.lock

@@ -25,8 +25,10 @@ dependencies = [
     "attrs",
     "boto3",
     "duckdb",
+    "duckdb_engine",
     "pandas",
     "pyarrow",
+    "sqlalchemy"
 ]
 
 [project.optional-dependencies]