Make sure sending cancel request in StatementClient.close

[takezoe]

Purpose

Make sure sending cancel request in StatementClient.close()

Overview

StatementClient.close() sends a cancel request:

trino-client-ruby/lib/trino/client/statement_client.rb

Lines 264 to 280 in 55c3bdc

	def close
	return unless running?
	@state = :client_aborted
	begin
	if uri = @results.next_uri
	@faraday.delete do |req|
	req.url uri
	end
	end
	rescue => e
	end
	nil
	end
	end

But it doesn't if any errors happen inside the client because state is changed to client_error in exception!():

trino-client-ruby/lib/trino/client/statement_client.rb

Lines 133 to 136 in 55c3bdc

	def exception!(e)
	@state = :client_error
	raise e
	end

This change will make sure sending a cancel request when StatementClient.close() is called unless state is finished, query_failed or client_abort.

Checklist

• Code compiles correctly
• Created tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary

[takezoe]

This change seems to make behavior of StatementClient inconsistent with Java's StatementClient:
https://github.com/trinodb/trino/blob/4b454b8573de6d1e4e4d32944a3e154322ab9ce3/client/trino-client/src/main/java/io/trino/client/StatementClientV1.java#L556

We will consider different ways.