* Update `sendAndConfirmTransaction` to use `preflightCommitment` of
`recent`. For the token tests, on my machine, it took roughly 18.5
seconds, and with `skipPreflight: true` it was about 21.5 seconds.
* Fix lint check in CI
* `npm run lint` now checks that code is properly formatted, instead of
running the formatter
* Add extra commands to run the linting, include ts definitions file
* Update flow-bin, fix type errors that come up
* Clarify lint vs lint:fix as requested