Support Virtual Thread Dispatcher for Pekko Projections

Currently, Pekko Projections only support the `blocking-jdbc-dispatcher` (see https://pekko.apache.org/docs/pekko-projection/current/jdbc.html). Are there any plans to start supporting a new dispatcher that uses Virtual Threads, similar to what has been achieved in the standard actor dispatcher ?

Start with the JDBC documentation's `blocking-jdbc-dispatcher` and compare it with the standard actor dispatcher support for Virtual Threads. Determine the intended scope for a Pekko Projections dispatcher and identify the relevant implementation and test entry points before defining completion criteria; the issue names no files or tests.

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