r.in.srtm: Fix exception handling and add specific error types

[arohanajit]

Following Exceptions added

• zipfile.BadFIle and zipfile.LArgeFile for file related errors. and PermissionError incase it does not have enough permission to be accessed
• In second, since gs module is used, I added CalledModuleError, I can also do a generic Exception here if required

[nilason]

I don’t understand what is “temporal” with this PR?

[arohanajit]

Yes, it shouldve been under r.*. I misclassified it

[echoix]

I went through the docs of zip file and the chosen exceptions make sense. ValueError shouldn't happen as we set the ".zip" extension. I didn't find PermissionError in the page, but it makes sense when opening a file.

So everything is fine with me!