Use empheral port for mysqli fake server tests

Make MySQLnd protocol stmt test work on 32bit

Closes GH-16869.

Make MySQLnd protocol stmt test work on 32bit

Fix GHSA-h35g-vwh6-m678: Mysqlnd - various heap buffer over-reads

This fixes issues causing buffer over-read that leak heap content:
- RESP packet field default left over for COM_LIST

Fix GHSA-h35g-vwh6-m678: Mysqlnd - various heap buffer over-reads

This fixes issues causing buffer over-read that leak heap content:
- RESP packet field default left over for COM_LIST
- RESP packet upsert filename
- OK packet message
- RESP packet for stmt row data
- ps_fetch_from_1_to_8_bytes
- ps_fetch_float
- ps_fetch_double
- ps_fetch_time
- ps_fetch_date
- ps_fetch_datetime
- ps_fetch_string
- ps_fetch_bit
- RESP packet for query row data (just possible overflow on 32bit)

It also adds various protocol tests using a new fake server.

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