To avoid all project info being loaded from DB, pagination is added for projects and perform housekeeping in smaller portions.

* Add HousekeepingProjectFetchSize in config

Fix checking the last page

Add housekeeping project fetch size option to the CLI flag

* set project fetch size to 100 in config.sample.yml

fix lint

Move housekeepingProjectPage variable into the Housekeeping.run function

Add keyset pagination to find projects

* update housekeeping test not to set project id to zero value

* Cleanup code
* add pagination test for memory db

Cleanup test

* add test code for mongo client

* clean up test code