Add blacklist/whitelist of signal and synchronous update types

Is your feature request related to a problem? Please describe.
Signals, even ones that workflow doesn't care about, still consume workflow history. In some use cases, signals are expected only in certain workflow states, and signals received in other states should be rejected.

Describe the solution you'd like
Workflow should support blacklisting and whitelisting signal and update types it cares about. Blacklisted signals and updates are rejected immediately without updating the mutable state and the history.

Start by locating the workflow signal and synchronous update handling paths and read how incoming types are recorded in mutable state and workflow history. Determine where blacklist and whitelist configuration would be defined and how rejected inputs should be exposed. Done means supported signal and update types are filtered before state or history changes, with tests covering both blacklist and whitelist behavior.