BREAKS: Reactive create authentication response

[maccuaa]

Re-opening PR #1063 (I accidentally opened that PR from master instead of creating a new branch)

Make the OpenIdAuthenticationMapper.createAuthenticationResponse interface method reactive. This brings the interface in line with the OauthAuthenticationMapper. createAuthenticationResponse interface method.

This will allow developers to make non-blocking API calls in the AuthenticationMapper.

Fixes #927

[maccuaa]

@sdelamo I see Micronaut Security 4.0.0-M1 was released. Any chance this PR can get merged to be included in the 4.0 release? The previous PR was targeted at the 4.0 release since its a breaking change - #1063 (comment)

[sdelamo]

@sdelamo I see Micronaut Security 4.0.0-M1 was released. Any chance this PR can get merged to be included in the 4.0 release? The previous PR was targeted at the 4.0 release since its a breaking change - #1063 (comment)

Yes, we need a milestone of security to release a milestone of the framework but there will be additional releases of Micronaut Security and they will include breaking changes.

[sdelamo]

Please, add a section to breaks.adoc explaining the breaking change?

[maccuaa]

Please, add a section to breaks.adoc explaining the breaking change?

Done.