Added support for adding new types operands to the engine.

src/lib-sieve/sieve-actions.c

src/lib-sieve/sieve-address-parts.c

src/lib-sieve/sieve-code.c

src/lib-sieve/sieve-code.h

src/lib-sieve/sieve-comparators.c

src/lib-sieve/sieve-extensions.h

src/lib-sieve/sieve-match-types.c