chore: Improve error messages

currently:

> stackablectl stack install trino-iceberg
An unrecoverable error occured: failed to execute stack (sub)command

Caused by these errors (recent errors listed first):
 1: failed to install stack
 2: stack resource requests error
 3: failed to create kube client
 4: failed to create Kubernetes client
 5: Failed to infer configuration
 6: failed to infer config
 7: failed to determine current context

This is a bit cryptic. it would be good to catch this error and print a more readable message like "could not connect to Kubernetes cluster" or "No Kubernetes configuration found" or something like that. Possibly with context information like "tried connecting to ..." or "tried reading file at ..."

stackablectl stack install trino-iceberg コマンドから始め、報告されている Kubernetes クライアントと設定推論のエラーを追跡します。完了条件は、暗号的な入れ子のエラーチェーンを、接続や設定不足に関するガイダンスなどの読みやすいメッセージに置き換え、利用可能な場合は関連するコンテキストも含めることです。