Chat request builders

[kpavlov]

Introduced ChatRequestBuilder and chatRequest extensions to simplify constructing and configuring ChatRequests. Added corresponding async methods, tests, and updated examples to enhance usability and ensure consistent behavior.

Introduced a new samples module to demonstrate the usage of the LangChain4j-Kotlin library. Includes a ChatModel example and updates the root pom.xml to include the module. Updated dependencies and configurations to support Kotlin and the newly added artifacts.

Upgraded langchain4j dependencies to 1.0.0-alpha1 and replaced outdated builder syntax with concise Kotlin DSL in code examples. These changes improve clarity, maintain modernity, and ensure compatibility with the latest API.

Introduce a new OpenAiChatModelExample.kt showcasing asynchronous chat with OpenAI's GPT-4-based model. Updated pom.xml to include required dependencies, renamed ChatModel.kt to ChatModelExample.kt, and added logging configuration via simplelogger.properties. Enhanced README with updated sample references.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.05% (target: -1.00%)	✅ 80.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (57a1a0d)	176	142	80.68%
Head commit (59f1add)	191 (+15)	154 (+12)	80.63% (-0.05%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#62)	15	12	80.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 75.52%. Comparing base (57a1a0d) to head (59f1add).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...kotlin/model/chat/request/ChatRequestExtensions.kt	78.57%	3 Missing ⚠️
...j/kotlin/model/chat/ChatLanguageModelExtensions.kt	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
- Coverage   75.56%   75.52%   -0.05%     
==========================================
  Files          14       15       +1     
  Lines         176      192      +16     
  Branches       15       15              
==========================================
+ Hits          133      145      +12     
- Misses         34       38       +4     
  Partials        9        9              

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