CowrieSession API. Closes #446

[regulartim]

Description

This PR introduces a new API endpoint: the CowrieSession API. It is meant to be (1) a replacement for the already existing CommandSequence API but also comes with new functionality. Compared to the CommandSequence API, the following things are changed:

• responses have the same structure, regardless if a IP address or a command sequence was queried
• responses optionally include the credentials used across matching Cowrie sessions
• responses optionally include detailed information about matching Cowrie sessions

Related issues

• Closes CowrieSession API #446

Type of change

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• 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).

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