Rename native asset ID

[PhilippGackstatter]

#2437 introduced AssetId, as a part of an AssetVaultKey. We also have the notion of the "native asset ID". It is the ID of the account that issued the native asset (= fee asset) and has nothing to do with the AssetId at all. Since this is very confusing, we should rename native asset ID to something else.

One alternative is "fee issuer ID", as some naming suggestions recently went more into the direction of "issuer ID" instead of "faucet ID".

This applies to various places in the kernel like memory::get_native_asset_id and FeeParameters::native_asset_id that need to be renamed.

[bobbinth]

One alternative is "fee issuer ID", as some naming suggestions recently went more into the direction of "issuer ID" instead of "faucet ID".

"fee issuer" sounds a bit off here (i.e., it sounds like the entity issuing fees) - so, maybe fee_faucet_id is better here. Though, I don't love it too much either and so other suggestions are welcome.

[JackTheGit]

Hi, I'd like to work on this issue if it's still available.

[VolodymyrBg]

Hi @PhilippGackstatter , can I take this issue?

[PhilippGackstatter]

@VolodymyrBg Yes, thank you! I'll assign you.