Improve error handling in Transport.kt

[haywood]

• Provide HTTP request and response details on SDKErrorResponse.
• Provide the cause of SDKError for chaining and re-throwing
• Add LookerApiException, which includes the same request/response information as SDKErrorResponse.
• Mark ok() as Deprecated, because it throws java.lang.Error, which is not something application code should do.
• Add SDKResponse::getOrThrow() instance method, patterned after Kotlin's built-in Result type, which handles SDKErrorResponse by throwing the newly introduced LookerApiException

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Fixes #1539 🦕

[drstrangelooker]

LGTM