adjust tag matching to better handle some eastern scripts #508
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the current hashtags matching and normalizing works fine with latin scripts, but it often breaks when having to deal with e.g. Japanese hashtags, which can results in hashtags not being extracted properly or worse, the posts being dropped entirely
the hashtags matching has beed extended to allow for more characters to match, and normalization process has been adjusted to better handle nonlatin script (e.g. Japanese, Thai)
most of the process is a recreation of Mastodon hastags normalization process (see https://docs.joinmastodon.org/spec/activitypub/#Hashtag and the linked normalizer)