Fix a bug where detected TCP traffic from pods short time before their deletion time could be labeled as incoming traffic from the internet

[omris94]

Description

We fixed this bug by creating a TTL cache for pod IPs with an expiry time of 10 minutes.

Testing

Describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

Please include any manual steps for testing end-to-end or functionality not covered by unit/integration tests.

Also include details of the environment this PR was developed in (language/platform/browser version).

• [x] This change adds test coverage for new/changed/fixed functionality

Checklist

• [x] I have added documentation for new/changed functionality in this PR and in github.com/otterize/docs