[CAT-126] ADD: pagination to ListSubmissions

[pastap]

Summary

Including the old changes from this PR when pagination was first added
https://github.com/IndicoDataSolutions/indico-client-python/pull/90/files
Includes a fix for the doc report pagination - which didn't add the after variable to the query to allow for pagination - after is used to indicate where the next page should start

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• Jira story/task is put into PR title
• Code has been self-reviewed
• Hard-to-understand areas have been commented
• Documentation has been updated
• My changes generate no new warnings
• Unit tests have been added for base functionality and known edge cases
• Any dependent changes have been merged and published in downstream modules

[goatrocks]

lgtm! thank you