[Rpm-maint] [rpm-software-management/rpm] Add substring macro to expose lua's string.sub function (PR #2179)

[Carl George]

Sorry to keep bothering, but `%sub(-) %{lua:print(string.sub(arg[1], arg[2], arg[3]))}` doesn't seem to work on el7/el8/el9.

```
[root at rhel7-container:~]# rpm -E '%{sub foobar 1 3}'
error: Unknown option error: lua script failed: [string "<lua>"]:1: attempt to index global 'arg' (a nil value)
```
```
[root at rhel8-container:~]# rpm -E '%{sub foobar 1 3}'
error: Unknown option 
```
```
[root at rhel9-container:~]# rpm -E '%{sub foobar 1 3}'
error: Unknown option 
```

Got any tips for getting this working for `epel-rpm-macros`?

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