Feat/role color

[sdip15fa]

Introduction

This command can assign a color to a role.

• If a role is not specified, a role named "User-" is created and assigned to the user
  • or if that already exists, that role would be used
• If a color is not specified, a random color is generated using crypto.randomBytes(3)

Checklist

• [ ] Documentation is changed or added (if applicable)
• [x] Commit message follows the commit guidelines

[atlanna[bot]]

Thank you for opening this pull request. A maintainer will get by as soon as practical to review the changes.

[iamtraction]

/role update color: is already there to set a role's color and /role create color: can be used to create a new role with a color. this command doesn't seem useful to the majority of users.

[atlanna[bot]]

If you think this was a mistake, feel free to reopen this pull request.