libsql v0.2.1

• WasmEdge and Wasmtime runtimes for user-defined functions now support WASI; WasmEdge can also work with custom plugins
• CREATE FUNCTION and DROP FUNCTION is now unconditionally supported in the grammar; no change in existing semantics, it simply makes the amalgamation distribution simpler
• the new Rust libSQL shell is now included in the source code - contributions welcome!
• additional metrics - LIBSQL_STMTSTATUS_ROWS_READ and LIBSQL_STMTSTATUS_ROWS_WRITTEN are now available in sqlite3_stmt_status
• and more!