Feature Request: Expose the DuckDB version number

[jonathonadams]

Issue

The PACKAGE_NAME and PACKAGE_VERSION are exposed as constants as seen here, however the underlying DuckDB version is not.

Feature request

Add another constant, DUCKDB_VERSION, that exports the current DuckDB version of the respective package.

Reasoning / Use Case

As explained in the fetching DuckDB WASM extensions the URL to fetch in-tree extensions requires the DuckDB version number. Although the docs explain how you could manually fetch the extensions, from what I can tell there is no way to actually construct the URL from the exposed constants.

This is necessary if you want to pre-fetch the extensions, i.e. in a service worker, or to bundle the extension with the main WASM binary as part of the build step.

Importance

Nice to have