ext/pgsql: adding pg_put_copy_data/pg_put_copy_end.

pg_put_copy_data allows to send COPY commands to the server.
pg_put_copy_end signals the end of the n commands.

Both return 3

ext/pgsql: adding pg_put_copy_data/pg_put_copy_end.

pg_put_copy_data allows to send COPY commands to the server.
pg_put_copy_end signals the end of the n commands.

Both return 3 states ; 1, 0 and -1 when 1 is success, 0 the buffer queue
is full then -1 for errors.

Close GH-14325

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