ENG-1162: fix importing default column functions (#2956)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Ensures ClickHouse DEFAULT expressions are used as-is (no extra
quoting) in DDL/ALTER generation and adds Python/TypeScript e2e tests
verifying db-pull roundtrip with function defaults.
> 
> - **ClickHouse DDL generation (Rust)**:
> - Use defaults verbatim in `ALTER TABLE ... MODIFY COLUMN` and `CREATE
TABLE` paths
(`apps/framework-cli/src/infrastructure/olap/clickhouse.rs`,
`.../queries.rs`).
> - Remove extra formatting/quoting for defaults; preserve literals
`'...'`, numbers, and SQL functions (`xxHash64(_id)`, `now()`,
`today()`).
> - Add unit tests for function defaults in both `MODIFY COLUMN` and
`CREATE TABLE` flows.
> - **E2E tests**:
> - Add comprehensive Python and TypeScript db-pull tests validating
generated model defaults and successful migrate/apply with function and
literal defaults
(`apps/framework-cli-e2e/test/db-pull-defaults.test.ts`).
>   - Include special-character default cases.
> - **Schema utils**:
> - Update ClickHouse schema introspection field from `default_kind` to
`default_type` (`apps/framework-cli-e2e/test/utils/database-utils.ts`).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
3ab0104. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: LucioFranco