Add support for Spring Boot 3+

[homich1991]

In accordance to documentation on migration to SpringBoot 3 autoconfiguration file, from now should be placed slightly different.

Keeping both files (old and new) will keep support for versions older than Spring Boot 3 and will bring support of newer versions.

Also added documentation on @AfterBotRegistration annotation

[Juratbek]

I am also facing trouble while using this library with Spring Boot 3. Please release a new version for support

[equeiroz1]

There is already a PR fixing this: #1196 . I don't know why it's not merged.

@rubenlagus could you please do it ? Thanks in advance.

[mikhail-sidnev]

@Juratbek, while auto-config does not work automatically we have a workaround:

@Import(org.telegram.telegrambots.starter.TelegramBotStarterConfiguration.class)

[rubenlagus]

This should be fully supported now