[VOTE] PIP-302 Add new API readAllExistingMessages for TableView

[Xiangying Meng]

Hi dev,
   This thread is to start a vote for PIP-302 Add new API
readAllExistingMessages for TableView.
Discuss thread: https://lists.apache.org/thread/o085y2314o0fymvx0x8pojmgjwcwn59q
PIP: https://github.com/apache/pulsar/pull/21166

BR,
Xiangying