Refactor pgp_key_search_t #3392

Job	Run time
cmake-offline-googletest	4m 12s
cmake-offline-googletest-src	4m 13s
system-sexpp, sexpp shared libs on, rnp shared libs on	2m 45s
system-sexpp, sexpp shared libs on, rnp shared libs off	2m 44s
package-source	39s
system-sexpp, sexpp shared libs off, rnp shared libs on	2m 45s
ubuntu-latest [CC gcc; botan; shared libs on; GnuPG stable]	4m 13s
system-sexpp, sexpp shared libs off, rnp shared libs off	2m 48s
ubuntu-latest [CC clang; botan; shared libs on; GnuPG stable]	4m 18s
ubuntu-latest [CC gcc; openssl; shared libs on; GnuPG stable]	4m 24s
ubuntu-latest [CC clang; openssl; shared libs on; GnuPG stable]	4m 13s
ubuntu-20.04 [CC gcc; openssl; shared libs on; GnuPG stable]	3m 50s
ubuntu-latest [CC gcc; botan; shared libs off; GnuPG stable]	4m 30s
package	52s
debian-tests	16s
	46m 42s

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