feat: support macro template using `runmacro`

[ycexiao]

Problem

We are already templating .gr and .cif file to run macro inside diffpy.batchpdfsuite, but this functionality is more suitable to be implemented here.

It will be mainly used by diffpy.batchpdfsuite. But it can also be used by users directly:

Use case:

1. yuchen know little about PDF
2. yuchen find a macro template in the diffpy discourse
3. yuchen run

diffpy.app runmacro context.yaml --template <template.dp-in> -o output.dp-in  # output.dp-in is optional

where context.yaml is

# supported keys described in `template.dp-in` comment
profile: <profile-path>
phase1: <phase1-path>
...

4. yuchen get a output.dp-in file that he can check what's happening if he want.
   He also get the results if the template saves the results.

Proposed solution