What would you like to be added: As title

Why is this needed: All pruning schedule except AGPPruner only support level, L1, L2. While there are FPGM, APoZ, MeanActivation and Taylor, it would be much better if we can choose any pruner with any pruning schedule.

**Without this feature, how does current nni

For example, if there is a relationship transaction.session_id -> sessions.id and we are calculating a feature transactions: sessions.SUM(transactions.value) any rows for which there is no corresponding session should be given the default value of 0 instead of NaN.

Of course this should not normally occur, but when it does it seems more reasonable to use the default_value.

`DirectF

Problem
Since Java 8 was introduced there is no need to use Joda as it has been replaced the native Date-Time API.

Solution
Ideally greping and replacing the text should work (mostly)

Additional context
Need to check if de/serializing will still work.

We should add a short guide on how users can use Feast by only using gRPC clients. This is useful for both developers and for teams not wanting to have Feast dependencies.

Context: https://kubeflow.slack.com/archives/CE0L8T267/p1607671093340700?thread_ts=1607669754.338100&cid=CE0L8T267

• add optimized metric
• add total run time
• add validation metric
• add parameters used in AutoML