Migrate remaining code to Kotlin

[alexander-yevsyukov]

This PR migrates remaining production code from Java to Kotlin.

Other notable changes

• System property names that were prefixed with flogger. now use the prefix spine.logging..

[codecov]

Codecov Report

❌ Patch coverage is 69.72477% with 132 lines in your changes missing coverage. Please review.
✅ Project coverage is 14.37%. Comparing base (7655043) to head (6d6880c).
⚠️ Report is 34 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #133      +/-   ##
============================================
- Coverage     14.82%   14.37%   -0.46%     
+ Complexity      147      120      -27     
============================================
  Files           102      102              
  Lines          2691     2658      -33     
  Branches        374      377       +3     
============================================
- Hits            399      382      -17     
+ Misses         2262     2245      -17     
- Partials         30       31       +1     

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[Copilot]

Pull Request Overview

This PR completes the migration of remaining Java production code to Kotlin, focusing primarily on logging backend and platform implementations. The changes also include a version bump from 2.0.0-SNAPSHOT.400 to 2.0.0-SNAPSHOT.410.

• Migrated Java logging backend implementations to Kotlin
• Migrated platform system components from Java to Kotlin
• Updated version numbers across build files and dependencies

Reviewed Changes

Copilot reviewed 34 out of 35 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
version.gradle.kts	Version bump to 2.0.0-SNAPSHOT.410
pom.xml	Version bump to 2.0.0-SNAPSHOT.410
platforms/jvm-default-platform/src/test/kotlin/io/spine/logging/backend/system/DefaultPlatformSpec.kt	Updated method names from getXxxImpl to doGetXxxImpl for test methods
platforms/jvm-default-platform/src/main/kotlin/io/spine/logging/backend/system/SystemClock.kt	Migrated from Java to Kotlin
platforms/jvm-default-platform/src/main/kotlin/io/spine/logging/backend/system/StackBasedCallerFinder.kt	Migrated from Java to Kotlin
platforms/jvm-default-platform/src/main/kotlin/io/spine/logging/backend/system/DefaultPlatform.kt	Migrated from Java to Kotlin
contexts/grpc-context/src/main/kotlin/...	Migrated grPC context classes from Java to Kotlin
backends/log4j2-backend/src/main/kotlin/...	Migrated Log4j2 backend classes from Java to Kotlin
backends/jul-backend/src/main/kotlin/...	Migrated JUL backend classes from Java to Kotlin
dependencies.md	Updated timestamps and version references

Files not reviewed (1)

• .idea/inspectionProfiles/Project_Default.xml: Language not supported

[Copilot]

Pull Request Overview

Copilot reviewed 34 out of 35 changed files in this pull request and generated 4 comments.

Files not reviewed (1)

• .idea/inspectionProfiles/Project_Default.xml: Language not supported

[armiol]

@alexander-yevsyukov LGTM except for a tiny request.