document that using `node:sqlite` requires `--experimental-sqlite` flag

[trentm]

Affected URL(s)

https://nodejs.org/api/sqlite.html

Description of the problem

In Node.js v22.5.0, sqlite was exposed as the builtin node:sqlite module. Neither the blog post, nor the API docs (https://nodejs.org/api/sqlite.html) mention that one must use node --experimental-sqlite ... to get access to the module. Adding that mention would help avoid spurious bug reports like #53905 that I just opened. :)