[lib] add conditions for adding keyserver to the keyserver store

Summary:
This diff adds two conditions for adding a new keyserver to the keyserver store. The first condition resets the keyserver store whenever we logout/delete account/or change session, the second adds the keyserver into the keyserver store

Making @inka a blocking reviewer since she is currently working a lot with this file and I want to make sure that these changes don't interfere with anything that is currently "in flight"

Linear task: https://linear.app/comm/issue/ENG-5342/add-a-condition-for-the-new-addkeyserveractiontype

Depends on D9591

Test Plan:
Confirmed that the keyserver was added to the keyserver store

Logs of the keyserver store where I added a dummy keyserver info

Reviewers: inka, rohan, michal

Reviewed By: inka

Subscribers: inka, ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9664