feat: new sdk core initial commit

.editorconfig

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+
+# Configuration file for EditorConfig: http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# space indentation for JSON and YML
+[*.{json,json5,yml,yaml}]
+indent_size = 2
+
+[*.kt]
+ktlint_standard_enum-entry-name-case = disabled

.github/workflows/generate-publish-sdk.yaml

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+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        type: string
+        description: "Version to publish. For snapshot releases, add `-SNAPSHOT` suffix to the version. For example, `1.0.0-SNAPSHOT`."
+        required: true
+
+jobs:
+  generate-and-publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-java@v3
+        with:
+          distribution: 'corretto'
+          java-version: '21'
+
+      - uses: gradle/actions/setup-gradle@v4
+        with:
+          gradle-version: "8.13"
+
+      - name: Install Post Processor
+        working-directory: generator/src/main/resources/post-processor
+        run: npm ci && npm run clean && npm run compile
+
+      - run: gradle build
+
+      - name: Generate SDK
+        working-directory: generator
+        run: |
+          export KOTLIN_POST_PROCESS_FILE="npm run --prefix src/main/resources/post-processor process"
+          gradle openApiGenerate
+
+      - name: Open PR
+        uses: peter-evans/create-pull-request@v7
+        working-directory: xap-sdk
+        with:
+          token: ${{ secrets.GITHUB_PAT }}
+          commit-message: "chore: publishing code for sdk release $(date +'%Y%m%d%H%M%S')"
+          title: "chore: code update on $(date +'%Y%m%d%H%M%S')"
+          branch: "xap-sdk-code-update-$(date +'%Y%m%d%H%M%S')"
+          add-paths: .
+
+      - name: Publish SDK
+        working-directory: xap-sdk
+        env:
+          GPG_PASSPHRASE: ${{ secrets.GPG_PRIVATE_KEY_PASSPHRASE }}
+          GPG_SECRET: ${{ secrets.GPG_PRIVATE_KEY }}
+          SONATYPE_USERNAME: ${{ secrets.SONATYPE_USERNAME }}
+          SONATYPE_PASSWORD: ${{ secrets.SONATYPE_PASSWORD }}
+        run: |
+          version="${{ github.event.inputs.version }}"
+          version="${version// /}"
+          if [[ "$version" == *"-SNAPSHOT" ]]; then
+            gradle publishSnapshot -PVERSION="${version}"
+          else
+            gradle publishToSonatype closeAndReleaseSonatypeStagingRepository -PVERSION="${version}"
+          fi

.gitignore

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+.gradle
+.idea
+
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Kotlin ###
+.kotlin
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store