Add X509::Certificate#tbs_bytes #1035

Job	Run time
openssl-1.0.2u	2m 32s
openssl-1.1.0l	1m 42s
openssl-1.1.1w	1m 40s
openssl-3.0.13	2m 47s
openssl-3.1.5	2m 50s
openssl-3.2.1	3m 29s
openssl-3.3.0	3m 26s
libressl-3.1.5	1m 47s
libressl-3.2.7	1m 44s
libressl-3.3.6	1m 57s
libressl-3.4.3	1m 49s
libressl-3.5.3	2m 17s
libressl-3.6.3	2m 16s
libressl-3.7.3	2m 15s
libressl-3.8.4	2m 12s
libressl-3.9.1	2m 9s
openssl-3.0.13 fips	2m 48s
openssl-3.1.5 fips	2m 59s
openssl-3.2.1 fips	3m 17s
openssl-3.3.0 fips	3m 16s
openssl-head	3m 33s
openssl-head fips	3m 26s
openssl-head no-legacy	3m 28s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	58s
ubuntu-22.04 3.0	52s
ubuntu-22.04 3.1	56s
ubuntu-22.04 3.2	1m 0s
ubuntu-22.04 3.3	58s
ubuntu-22.04 head	55s
ubuntu-22.04 truffleruby	1m 24s
ubuntu-22.04 truffleruby-head	1m 29s
ubuntu-20.04 2.7	53s
ubuntu-20.04 3.0	52s
ubuntu-20.04 3.1	51s
ubuntu-20.04 3.2	52s
ubuntu-20.04 3.3	49s
ubuntu-20.04 head	54s
ubuntu-20.04 truffleruby-head	1m 26s
macos-latest 2.7	47s
macos-latest 3.0	44s
macos-latest 3.1	51s
macos-latest 3.2	46s
macos-latest 3.3	36s
macos-latest head	43s
macos-latest truffleruby-head	57s
windows-latest 2.7	5m 16s
windows-latest 3.0	4m 53s
windows-latest 3.1	4m 33s
windows-latest 3.2	4m 21s
windows-latest 3.3	4m 53s
windows-latest ucrt	3m 39s
windows-latest mswin	2m 48s
	1h 50m 38s

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