[BREAKING] Only store hash of distributions over time

[dee-kryvenko]

Evaluation resource has been storing list of replicas to each history
record. It appears to still blow out of the waters the size of the
object on big number of replicas. This change removes the distribution
from history records on evaluations. The idea is that we store the last
known projected winning distribution and compare it to the current one,
and if current one becomes the winner - we store it insead. At no point
in time we should need to know any other non-winning distribution, other
than what was its hash, how many times we've seen it and when was the
last time we've seen it.

There would be an edge case when a while ago there was a very much
wanted distribution that no longer wanter but it's total seen count is
higher than any of the current distributions. When that huge part of the
history goes out of the bounds and getting erased - we might not have
current projection anymore. In that case evaluator will go in not ready
state for a while until the new projected winning distribution is clear.

This change updates CRDs in-place with removal of fields, which is ok
because this is still beta.