Add support for the enw arguments in Redis 6.2 for PEXPIRE as specified at https://redis.io/commands/PEXPIRE.

Detail of update: Added options NX, XX, GT and LT.

This is part of #820.
Note: Due to the autogenerated nature of this, some of this may be already implemented.