Ensure Result#fields and #rows are always arrays #1090

Job	Run time
Ruby Head Debug	6m 7s
MariaDB 12.1 (debian:bookworm, Ruby 3.3.10)	4m 33s
MariaDB 12.1 (debian:bookworm, Ruby 4.0.2)	4m 47s
MariaDB 10.11 (ubuntu:focal, Ruby 4.0.2)	4m 26s
MariaDB 12.1 (ubuntu:focal, Ruby 4.0.2)	4m 39s
MariaDB 12.1 (ubuntu:noble, Ruby 4.0.2)	4m 25s
MariaDB 10.6 (ubuntu:focal, Ruby 4.0.2)	4m 48s
MariaDB 11.4 (ubuntu:focal, Ruby 4.0.2)	4m 48s
MariaDB 12.1 (ubuntu:focal, Ruby 4.0.2)	4m 47s
MySQL 9.6 (ubuntu:jammy, Ruby 4.0.2, ssl=true)	4m 30s
MySQL 8.4 (ubuntu:jammy, Ruby 4.0.2, ssl=true)	4m 40s
MySQL 8.0 (debian:bookworm, Ruby 3.3.10, ssl=true)	4m 53s
MySQL 8.0 (debian:bookworm, Ruby 3.3.10, ssl=false)	4m 25s
MySQL 8.0 (ubuntu:noble, Ruby 4.0.2, ssl=true)	5m 3s
MySQL 9.6 (ubuntu:noble, Ruby 4.0.2, ssl=true)	4m 58s
MySQL 8.0 (ubuntu:focal, Ruby 4.0.2, ssl=true)	5m 7s
MySQL 8.0 (ubuntu:jammy, Ruby 4.0.2, ssl=true)	4m 40s
MySQL 9.6 (ubuntu:focal, Ruby 4.0.2, ssl=true)	5m 9s
MySQL 8.0 (ubuntu:jammy, Ruby 3.3.10, ssl=true)	4m 32s
MySQL 8.4 (debian:bookworm, Ruby 4.0.2, ssl=true)	5m 14s
MySQL 8.0 (debian:bookworm, Ruby 4.0.2, ssl=true)	5m 11s
MySQL 8.4 (ubuntu:noble, Ruby 4.0.2, ssl=true)	5m 10s
MySQL 9.6 (debian:bookworm, Ruby 4.0.2, ssl=true)	4m 57s
MariaDB 11.8 (ubuntu:focal, Ruby 4.0.2)	4m 48s
MariaDB 12.1 (ubuntu:jammy, Ruby 4.0.2)	4m 23s
MySQL 8.4 (ubuntu:focal, Ruby 4.0.2, ssl=true)	5m 22s
	2h 6m 22s

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