Kotlin snippets fixes

[ToniCorinne]

• Fix ktlint_code_style
• Lint cleanup of existing snippets
• Migrating from Map to typed data classes in FuncTool.kt and LongRunningTool.kt
• Adding gradle wrapper

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[koverholt]

KSP return type fixes are working. Formatting looks good. Thanks!

Still failing on an unused import and lots of warnings about ktlint_code_style = google being unrecognized in .editorconfig.

[ToniCorinne]

@koverholt Fixes have been applied.

[koverholt]

Thanks for fixing the Kotlin CI tests! LGTM. Left one comment but not blocking. Will merge after ADK 2.0 docs PR is in to avoid additional conflicts / noise for that.