remove deprecated spring module and related components

[halotukozak]

No description provided.

[Copilot]

Pull request overview

Removes the deprecated commons-spring submodule and its associated Spring/HOCON integration utilities, along with related test sources and resources, and cleans up build + README references.

Changes:

• Deletes the spring subproject sources (e.g., HoconBeanDefinitionReader, HoconType, ScalaDefaultValuesInjector, AttrNames) and its tests/resources.
• Updates SBT build definition to drop the spring subproject and Spring dependency version.
• Updates README.md to remove the deprecated commons-spring module entry.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
spring/src/test/scala/com/avsystem/commons/spring/XmlPlayground.scala	Removes deprecated Spring/HOCON playground code.
spring/src/test/scala/com/avsystem/commons/spring/Playground.scala	Removes deprecated HOCON playground code.
spring/src/test/scala/com/avsystem/commons/spring/HoconBeanDefinitionReaderTest.scala	Removes Spring/HOCON reader test suite and test beans.
spring/src/test/resources/testBean.conf	Removes Spring/HOCON bean-definition test config.
spring/src/test/resources/conditionalsNested.conf	Removes conditional-includes test config.
spring/src/test/resources/conditionalsEnabled.conf	Removes conditional-includes test config (enabled case).
spring/src/test/resources/conditionalsDisabled.conf	Removes conditional-includes test config (disabled case).
spring/src/test/resources/conditionalInclude.conf	Removes conditional include file used by tests.
spring/src/test/resources/beans.xml	Removes XML bean-definition fixture.
spring/src/test/resources/beans.conf	Removes HOCON bean-definition fixture.
spring/src/test/resources/bean2.conf	Removes auxiliary bean fixture.
spring/src/test/resources/bean1.conf	Removes auxiliary bean fixture.
spring/src/main/scala/com/avsystem/commons/spring/package.scala	Removes package object constants used for deprecation messaging.
spring/src/main/scala/com/avsystem/commons/spring/ScalaDefaultValuesInjector.scala	Removes Spring BeanDefinitionRegistryPostProcessor implementation.
spring/src/main/scala/com/avsystem/commons/spring/HoconType.scala	Removes HOCON-to-type decoding typeclass and instances.
spring/src/main/scala/com/avsystem/commons/spring/HoconBeanDefinitionReader.scala	Removes the deprecated Spring bean definition reader implementation.
spring/src/main/scala/com/avsystem/commons/spring/AttrNames.scala	Removes Spring/HOCON attribute key definitions and mappings.
project/Commons.scala	Drops spring subproject and its dependency/version wiring from the build.
README.md	Removes documentation of deprecated commons-spring module.

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