Re: track generic and custom plans in pg_stat_statements

After the introduction of pg_overexplain extension and Robert's comment 
[0], I'm starting to have doubts about whether it's still appropriate to 
add this information to EXPLAIN itself. If there are compelling reasons 
that showing the plan type would be broadly useful to users in EXPLAIN, 
I’m happy to proceed. Otherwise, perhaps this is something better suited 
for extension.

[0]: 
https://www.postgresql.org/message-id/CA%2BTgmoZ8qXiZmmn4P9Mk1cf2mjMMLFPOjSasCjuKSiHFcm-ncw%40mail.gmail.com

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Best regards,
Ilia Evdokimov,
Tantor Labs LLC.