fix: add back member invite alias

[k3llymariee]

This was accidentally removed when we generated the remaining resources from the openapi spec

Running ldcli members --help shows the new command:

Usage:
  ldcli members [command]

Available Commands:
  create       Invite new members
  create-teams Add a member to teams
  delete       Delete account member
  get          Get account member
  invite       Invite new members
  list         List account members
  update       Modify an account member

Global flags:
  -h, --help                  Get help about any command
      --access-token string   LaunchDarkly access token with write-level access
      --analytics-opt-out     Opt out of analytics tracking
      --base-uri string       LaunchDarkly base URI (default "https://app.launchdarkly.com")
  -o, --output string         Command response output format in either JSON or plain text (default "plaintext")

Use "ldcli members [command] --help" for more information about a command.

Note that the short description is the same as what we have for create, which comes straight from the openapi spec. Not sure what else we might want to put here instead.

[k3llymariee]

see comment in pr description: this is the same as what we have for create, which comes straight from the openapi spec. Not sure what else we might want to put here instead.