Refactor attribute filtering to apply per-flag #345
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Closes #343
Closes #344
In blackbeam/rust_mysql_common#87, it was pointed out that the new attribute filtering added in #341 causes large flags declarations to hit the default 128-deep recursion limit. I've refactored that code now so that instead of filtering all attributes on all flags upfront, it filters attributes on each flag individually at the points we need them. This reduces the stack depth by the most complex individual flag, rather than the sum of all flags.