List options for `rails new --webpack=WEBPACK`

When you type `rails new -h`, the `--database=DATABASE` options display
this useful message:

> Preconfigure for selected database (options: mysql/postgresql/sqlite3/oracle/frontbase/ibm_db/sqlserver/jdbcmysql/jdbcsqlite3/jdbcpostgresql/jdbc)

However, the `--webpack=WEBPACK` option only displays this:

> Preconfigure for app-like JavaScript with Webpack

so it's hard to know *which* values are valid for `WEBPACK`.

This commit improves the help message to display:

> Preconfigure for app-like JavaScript with Webpack (options: react/vue/angular)

The implication of this commit is that the list needs to be manually updated
whenever rails/webpacker adds support for a new framework.

However, I don't imagine this list to change very frequently, and I think that
the benefit of display the list to the users is greater than the hustle of
updating the list when needed.

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