[FEATURE REQ] Improve AadAuthenticationFilterAutoConfiguration dependencies

[moarychan]

Context

Currently, SCA provides the configuration AadAuthenticationFilterAutoConfiguration to support resource server scenarios, but there's a condition @ConditionalOnMissingClass({ "org.springframework.security.oauth2.server.resource.authentication.BearerTokenAuthenticationToken" }) to block using the resource server dependencies, SCA should improve this limitation.

Goal

Make the configuration AadAuthenticationFilterAutoConfiguration enabled when the resource server dependencies exist.

• Update samples to use a resource server starter, not the spring-security-oauth2-core, see comments from PR https://github.com/Azure-Samples/azure-spring-boot-samples/pull/582
• Update doc(migration & code snappets)

[chenrujun]

but there's a condition @ConditionalOnMissingClass({ "org.springframework.security.oauth2.server.resource.authentication.BearerTokenAuthenticationToken" }) to block using the resource server

IMU, it's designed by purpose. When using spring-security-oauth2-resource-server (BearerTokenAuthenticationToken), AadAuthenticationFilterAutoConfiguration should not be enabled.

AadAuthenticationFilterAutoConfiguration is a method to implement resource-server, spring-security-oauth2-resource-server is another way to implement resource-server. The 2 methods should not work at the same time.

This is first added in this commit by @moarychan .