Integrate or replace the TOTP library

[federicaagostini]

Currently, we rely on dev.samstevens.totp for TOTP generation, that seems not maintained.

Evaluate if we can include inside the IAM code base what is used, or replace it with another well maintained library.

[DonaldChung-HK]

Related to #1173

[garaimanoj]

There are several available libraries:

• https://github.com/BastiaanJansen/otp-java
• https://github.com/jchambers/java-otp
• https://github.com/TominoLP/2FA-API
• https://github.com/Osmerion/OneTrickPony

With the exception of the last one, all of these were last updated 2–3 years ago.

From what I can see in Maven Central, the library we’re currently using is still the most widely adopted:

Given the details in issue‑1173, is this task(1160) still relevant? @enricovianello