refactor(spring): move auto-configuration registration to AutoConfiguration.imports as is recommended from Spring Boot 2.7

[bednar]

Closes #468

Use META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports for registration of auto-configuration.

Proposed Changes

Auto-configuration Registration

If you have created your own auto-configurations, you should move the registration from spring.factories 
under the org.springframework.boot.autoconfigure.EnableAutoConfiguration key to a new file named 
META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports. Rather than a single
comma-separate list, each line contains the fully qualified name of an auto-configuration class. 
See [the included auto-configurations](https://github.com/spring-projects/spring-boot/blob/main/spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports) 
for an example.

https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.7-Release-Notes#auto-configuration-registration

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• mvn test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Base: 88.39% // Head: 88.39% // No change to project coverage 👍

Coverage data is based on head (6cb5c39) compared to base (cec6457).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #470   +/-   ##
=========================================
  Coverage     88.39%   88.39%           
  Complexity      779      779           
=========================================
  Files           172      172           
  Lines          7008     7008           
  Branches        378      378           
=========================================
  Hits           6195     6195           
  Misses          693      693           
  Partials        120      120           

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.