Adding variables for segment_size, wal_segment_size and block sizes

Now that we have customizable segment sizes for heap and WAL at compilation

time i would like to have some runtime variables to query that information

(besides pg_controldata). I can imagine to have the following names:

segment_size: Re****ts heap segment size
wal_segment_size: Re****ts wal segment size
block_size: Available yet
wal_block_size: wal block size

I'd like to implement them if we agree on them

-- 
  Thanks

                    Bernd

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