🚮 Remove adaMinimum field from ApiWalletUtxoSnapshotEntry type.

[jonathanknowles]

Issue

ADP-3122

Summary

This PR removes the adaMinimum field from the ApiWalletUtxoSnapshotEntry type.

Context

The original purpose of this field was to aid debugging, and specifically to answer the following question:

“For a given UTxO that already exists, what would the ledger have required the minimum quantity of ada to be at the time the UTxO was originally created?”

In general this question is quite hard to answer, as for every historical UTxO that belongs to the wallet, we’d need to know:

• in which era was this UTxO created?
• at which slot (within an era) was this UTxO created?
• what were the values of the protocol parameters at the time the UTxO was created?

This is because the minimum UTxO function can change:

• as we transition from one era to another; and/or
• whenever the protocol parameters are updated.

Finally, since:

• this field is for debugging purposes only;
• it has maintenance burden that is hard to satisfy;
• it is an obstacle to ongoing work in other areas; and since
• there is little evidence of user demand for this field,

We should feel free to remove it.

[Unisay]

LGTM