Add decorator @Extractor.rule for specific rules

[ITAYC0HEN]

Description
I believe it will be great to have something like @Extractor.rule that will have a function name that matches one of the items in yara_rules = [...] and will only trigger per this rule.

class Evil(Extractor):
    yara_rules = ["trojan_cn_evil", "test_evil_v3"]
    family = "evil"
    ...    
    @Extractor.rule
    def trojan_cn_evil(self, p, matches):
        ...
    @Extractor.rule
    def test_evil_v3(self, p, matches):
        ...

Most likely, the call to this decorator should happen after the calls to specific strings in @Extractor.extractor.

I'd like the @Extractor.rule decorator to receive a matches argument of type YaraMatches (or similar) that will provide access to the following info

[
    {
        name: "matched_str_1",
        offset: 0x123456
        content: b"Hello World!\x00\x148"
    },
    {
        name: "matched_str_1",
        offset: 0x4346
        content: b"Hello World!\x06\x07\x148"
    },
    {
        name: "other_str",
        offset: 0x876
        content: b"\xe8\x02\x75\x07\x81\x04\x24\x00\x01\x00\x00\x50\xe8"
    },
    ...
]