[Rpm-maint] [rpm-software-management/rpm] install-time data API (Discussion #3874)

[Hank Donnay]

Here's what I've sketched out for an allowlist mechanism:

1. Grab some bits in the `rpmTagType` type for some flags (e.g. `#define RPM_MASK_TYPEFLAG 0x00ff0000`) and define one flag: `RPM_AUX_TYPEFLAG` that indicates the tag is only valid in an auxiliary header.
1. Create `rpmTagType_e` values that are all the defined types with the new typeflag OR'd.
1. Ensure checks against `RPM_MIN_TYPE`/`RPM_MAX_TYPE` mask the value first.
1. Update the `gentagtbl.sh` script to recognize an `auxiliary` argument that selects the correct "aux-allowed" value.
1. Update the `PACKAGEDIGESTS`/`PACKAGEDIGESTALGOS` definitions to have the new argument.
1. Update `lib/psm.cc`'s `mergeAux` function to check for the typeflag and ignore it if absent.

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