At the moment, when updating the inbox members, or team members the
account cache used for IndexedDB is not invalidated. This can cause
inconsistencies in the UI. This PR fixes this by adding explicit
invalidation after performing the member changes
### Summary of changes
1. Added a new method `add_members` and `remove_members` to both `team`
and `inbox` models. The change was necessary for two reasons
- Since the individual `add_member` and `remove_member` is called in a
loop, it's wasteful to run the cache invalidation in the method.
- Moving the account cache invalidation call in the controller pollutes
the controller business logic
2. Updated tests across the board
### More improvements
We can make a concern called `Memberable` with usage like
`memberable_with :inbox_members`, that can encapsulate the functionality
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Related: https://github.com/chatwoot/chatwoot/issues/10578
