feat: add wasmWasi target with console appender and tests

[oshai]

Summary Adds WebAssembly WASI (wasmWasi) target to kotlin-logging, reusing directMain logic and providing a simple console appender.

Motivation Enable kotlin-logging usage in WASI runtimes (e.g. wasmtime, Node.js WASI, future serverless/Wasm hosts) with minimal setup, consistent with existing wasmJs and native behavior.

Key Changes

Gradle: added wasmWasi target (with nodejs() environment) + source sets (wasmWasiMain / wasmWasiTest).
New actuals for wasmWasi:
KotlinLoggingConfiguration (simple mutable properties)
ConsoleOutputAppender (stdout println for all levels except OFF)
KLoggerNameResolver (mirrors wasmJs stacktrace-based resolver)
Tests: SimpleWasmWasiTest (basic logging + OFF level check)
Changelog: unreleased note about wasmWasi support.

Design Notes

Uses println (no stderr separation; WASI stderr mapping can be added later if needed).
Reuses directMain API surface; no public API changes.
Keeps implementation minimal to reduce maintenance burden.
Node.js runtime declared to satisfy current Gradle/WASM DSL expectations.
Testing

Compiled wasmWasi main & tests (compileKotlinWasmWasi / compileTestKotlinWasmWasi succeeded).
Did not run full build due to missing Android SDK in current environment (pre-existing constraint).
Logic mirrors existing wasmJs test patterns minus JS console interception.
Backward Compatibility

No breaking changes; new target only.
Existing platforms unaffected.

[Copilot]

Pull Request Overview

This PR adds WebAssembly WASI (wasmWasi) target support to kotlin-logging, enabling the library to work in WASI runtimes like wasmtime and Node.js WASI with minimal setup.

• Introduces wasmWasi target with console-based logging output
• Implements required actual classes for the new target (configuration, appender, name resolver)
• Adds comprehensive test coverage for the new functionality

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/wasmWasiMain/kotlin/io/github/oshai/kotlinlogging/KotlinLoggingConfiguration.kt	Provides wasmWasi-specific logging configuration with default settings
src/wasmWasiMain/kotlin/io/github/oshai/kotlinlogging/ConsoleOutputAppender.kt	Implements console output appender using stdout println for WASI target
src/wasmWasiMain/kotlin/io/github/oshai/kotlinlogging/internal/KLoggerNameResolver.kt	Provides stacktrace-based logger name resolution mirroring wasmJs implementation
src/wasmWasiTest/kotlin/io/github/oshai/kotlinlogging/SimpleWasmWasiTest.kt	Comprehensive test suite covering basic logging functionality and configuration
ChangeLog.md	Documents the addition of wasmWasi target support