Support more authenticators

[Bluscream]

I would love to see native support for non-totp 2fa like

• Steam (https://github.com/JustArchiNET/ArchiSteamFarm/blob/main/ArchiSteamFarm.OfficialPlugins.MobileAuthenticator/)
• Battle.NET (https://github.com/ttodua/winauth-revived/blob/master/Authenticator/SteamAuthenticator.cs)

so i dont have to use third-party tools like ASF and winauth in addition to vaultwarden

[BlackDex]

Steam is already supported: https://bitwarden.com/help/integrated-authenticator/#steam-guard-totps

And in general: https://github.com/dani-garcia/vaultwarden/wiki/FAQs#i-have-a-feature-request-for-the-web-vault-or-any-other-client - Since all clients need to support this, not only the web-vault.