Use 64 bits values to store `bf_matcher_type` bitmasks

[qdeslandes]

As we now have 30 different matchers available, we will need to ensure we store matcher types bit masks as 64 bits values instead to prevent UB (c.f. https://github.com/facebook/bpfilter/blob/main/src/bpfilter/cgen/matcher/set.c#L41).