pkey: avoid creating multiple wrapper objects for single EVP_PKEY #1238

Job	Run time
openssl-1.0.2u	26s
openssl-1.1.0l	34s
openssl-1.1.1w	34s
openssl-3.0.15	59s
openssl-3.1.7	1m 0s
openssl-3.2.3	58s
openssl-3.3.2	58s
openssl-3.4.0	1m 3s
openssl-master	3m 39s
libressl-3.1.5	27s
libressl-3.2.7	26s
libressl-3.3.6	37s
libressl-3.4.3	31s
libressl-3.5.3	28s
libressl-3.6.3	27s
libressl-3.7.3	26s
libressl-3.8.4	37s
libressl-3.9.2	25s
libressl-4.0.0	26s
openssl-3.0.15 with fips provider	47s
openssl-3.1.7 with fips provider	45s
openssl-3.2.3 with fips provider	37s
openssl-3.3.2 with fips provider	44s
openssl-3.4.0 with fips provider	39s
openssl-master with fips provider	3m 28s
openssl-3.4.0 without legacy provider	1m 7s
ruby-versions / Generate Ruby versions	3s
ubuntu-22.04 2.7	35s
ubuntu-22.04 3.0	30s
ubuntu-22.04 3.1	1m 3s
ubuntu-22.04 3.2	1m 5s
ubuntu-22.04 3.3	1m 1s
ubuntu-22.04 head	1m 3s
ubuntu-22.04 truffleruby	1m 33s
ubuntu-22.04 truffleruby-head	2m 3s
ubuntu-20.04 2.7	35s
ubuntu-20.04 3.0	29s
ubuntu-20.04 3.1	32s
ubuntu-20.04 3.2	27s
ubuntu-20.04 3.3	28s
ubuntu-20.04 head	29s
ubuntu-20.04 truffleruby	42s
ubuntu-20.04 truffleruby-head	54s
macos-latest 2.7	51s
macos-latest 3.0	22s
macos-latest 3.1	44s
macos-latest 3.2	37s
macos-latest 3.3	51s
macos-latest head	48s
macos-latest truffleruby	46s
macos-latest truffleruby-head	1m 23s
windows-latest 2.7	4m 58s
windows-latest 3.0	2m 50s
windows-latest 3.1	3m 15s
windows-latest 3.2	4m 59s
windows-latest 3.3	6m 2s
windows-latest head	4m 2s
windows-latest ucrt	4m 55s
windows-latest mswin	3m 18s
	1h 17m 21s

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