Add support for unit "B" to pg_size_bytes()
This makes it consistent with the units support in GUC.
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/
0106914a-9eb5-22be-40d8-
652cc88c827d%40enterprisedb.com