Refactor pgp_key_search_t #3390

Job	Run time
cmake-offline-googletest	4m 16s
cmake-offline-googletest-src	4m 30s
system-sexpp, sexpp shared libs on, rnp shared libs on	2m 57s
package-source	36s
system-sexpp, sexpp shared libs on, rnp shared libs off	3m 0s
system-sexpp, sexpp shared libs off, rnp shared libs on	3m 6s
ubuntu-latest [CC gcc; botan; shared libs on; GnuPG stable]	4m 16s
system-sexpp, sexpp shared libs off, rnp shared libs off	3m 2s
ubuntu-latest [CC clang; botan; shared libs on; GnuPG stable]	4m 9s
ubuntu-latest [CC gcc; openssl; shared libs on; GnuPG stable]	4m 17s
ubuntu-latest [CC clang; openssl; shared libs on; GnuPG stable]	4m 47s
ubuntu-20.04 [CC gcc; openssl; shared libs on; GnuPG stable]	3m 45s
ubuntu-latest [CC gcc; botan; shared libs off; GnuPG stable]	4m 21s
package	49s
debian-tests	20s
	48m 11s

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