Alert generator improvements

[hop-dev]

Improve the speed and function of the generate-alerts command. New usage:

# yarn start generate-alerts -n <number of alerts> -h <number of hosts within the alerts> -u <number of users within the alerts>

yarn start generate-alerts -n 1000000 -h 10000 -u 10000

A few improvements:

• batch up alerts for multiple entities in a single ES batch operation ⏩
• run batch operations concurrently ⏩
• Use faker host and usernames not Host-${i}
• add arguments for number of hosts and users within alerts
• Make a couple of config values optional which should haver been from the start 🐛

Example output with shiny new progress bar:

we dont have typechecking and linting on PRs here, here is proof its good ;)

> yarn typecheck
yarn run v1.22.21
$ tsc --noEmit
✨  Done in 1.27s.
> yarn lint
yarn run v1.22.21
$ eslint ./src
✨  Done in 0.79s.

[machadoum]

Great job! It is much faster 🚀 🚀 🚀