[Rpm-maint] [rpm-software-management/rpm] Add rpmtsAddEraseElement2 to API, extend rpmtsAddEraseElement with key data (#1360)

[Jaroslav Rohel]

Transaction set API offers functions to add items (packages) to transaction set:
```
int rpmtsAddInstallElement(rpmts ts, Header h, const fnpyKey key, int upgrade,
		rpmRelocation * relocs);
int rpmtsAddReinstallElement(rpmts ts, Header h, const fnpyKey key);
int rpmtsAddEraseElement(rpmts ts, Header h, int dboffset);
```

User can attach user data ("key" argument) to the transaction item.
However, user data cannot be attached in the case of `rpmtsAddEraseElement`
function.

This fix add a new API function `rpmtsAddEraseElement2` (to not break
the existing one) with added parameter `key` parameter.

`int rpmtsAddEraseElement2(rpmts ts, Header h, int dboffset, const fnpyKey key);`

Notes:
- PR helps to solve issue: https://github.com/rpm-software-management/rpm/issues/1213
- better API function name name than `rpmtsAddEraseElement2` ?
- `dboffset` is still not used
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1360

-- Commit Summary --

  * Add rpmtsAddEraseElement2 to API, extend rpmtsAddEraseElement with key data

-- File Changes --

    M lib/depends.c (15)
    M lib/rpmts.h (10)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1360.patch
https://github.com/rpm-software-management/rpm/pull/1360.diff

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