P3095 R0 ABI comparison with reflection

[wg21bot]

P3095R0 ABI comparison with reflection (Saksham Sharma)

[hanickadot]

Seen in SG7 without any pool taken. We recommend this to be seen by LEWGI and ABI group.

[hanickadot]

@inbal2l do you want to see it in LEWGI? We need library to decide if something like this is wanted. We can't answer ABI and usability concerns.