Improve handling of UNDETERMINED results

Add dedicated exceptions for UNDETERMINED (a retryable and a non-retryable kind)
Immediate writes: by default, immediately fail any write, incl. commit. Optionally (per-transaction or via global flag): retry the transaction body
Delayed writes: by default, immediately fail on commit. Optionally (per-transaction or via global flag): retry the transaction body
Ordinary OVERLOADED and UNAVAILABLE on commit: phase out treating them as fatal. Opt-in retries in YOJ 2.x, opt-out retries in YOJ 3.0.0. Via a tx manager flag

#165: Make YdbValidator implementation customizable via YdbRepository…

#165: Make `YdbValidator` implementation customizable via `YdbReposit…

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