remove OptManager._processed

Instead of having the core addon do postprocessing on body_size_limit,
we add a cache to the parsing function. First, this avoids any potential issues
with options and _processed getting out of sync. As anecdotal evidence,
the previous implementation did not clear _processed when body_size_limit was
reset to None. Second, it achieves the same end result without introducing a new
concept of a "_processed" scratch space. Third, it works even if addons aren't present,
and does not require workarounds as previously present in test_http2.py.

refs https://github.com/mitmproxy/mitmproxy/pull/2484#pullrequestreview-53101507

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