JBAI-18822 Refactor ai.koog:agents-ext module to extract files-rela…

[Elizaveta239]

…ted abstractions from agents

Motivation and Context

Currently, we (EmbArk) have a dependency on Code Engine's module ai.jetbrains.code.files:code-files-model, which is rather small module for working with files and filesystem. But the problem is that it has dependencies on one class from koog: ai.koog.agents.ext.tool.file.filter.GlobPattern which is located in ai.koog:agents-ext and adds dependencies on many various koog-related modules (and even on ktor-server).

So I moved GlobPattern.kt, FileSize.kt, FileSystemEntry.kt and FileSystemEntryBuilders.kt from ai.koog:agents-ext to rag:rag-base module.

Breaking Changes

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Type of the changes

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tests improvement
• Refactoring

Checklist

• The pull request has a description of the proposed change
• I read the Contributing Guidelines before opening the pull request
• The pull request uses develop as the base branch
• Tests for the changes have been added
• All new and existing tests passed

Additional steps for pull requests adding a new feature

• An issue describing the proposed change exists
• The pull request includes a link to the issue
• The change was discussed and approved in the issue
• Docs have been added / updated

[github-actions]

Qodana for JVM

1177 new problems were found

Inspection name	Severity	Problems
Check Kotlin and Java source code coverage	🔶 Warning	1157
Missing KDoc for public API declaration	🔶 Warning	20

@@ Code coverage @@
+ 72% total lines covered
17738 lines analyzed, 12845 lines covered
# Calculated according to the filters of your coverage tool

☁️ View the detailed Qodana report

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[Elizaveta239]

Updated to the fresh develop branch