lib-sieve: Added script metadata to binary dump output.

src/lib-sieve/sieve-binary-dumper.c

src/lib-sieve/sieve-script-private.h

src/lib-sieve/sieve-script.c

src/lib-sieve/sieve-script.h

src/lib-sieve/storage/dict/sieve-dict-script.c

src/lib-sieve/storage/ldap/sieve-ldap-script.c