Make row properties writable to match the behavior of the sqlite client

[ottomated]

In @libsql/client, column properties on rows are defined with writable: true.

Object.defineProperty(row, column, { value, enumerable: true, configurable: true, writable: true });

This was fixed in https://github.com/tursodatabase/libsql-client-ts/pull/166, but not in this repository.