[FEAT] Cache Github endpoint responses

[mpgxvii]

Is your feature request related to a problem? Please describe.
Following #247, it would be good to cache Github responses to improve response times, avoid the rate limits, and reduce unnecessary repeated calls.

Describe the solution you'd like
As suggested by @blootsvoets and @yatharthranjan, we can use the CachedMap impl and an ExpiringMap implementation for this. Also, taking into account the maximum memory usage.

Describe alternatives you've considered
Hazelcast for caching.

Priority
5

Difficulty
6

Additional context
Supports #247

[yatharthranjan]

other alternatives:

• Spring Cache: then we can use CacheManager to evict values (on memory limits). Spring Cache annotations are also compatible completely with Hazelcast so no migration needed if we move to hazelcast in the future. See more here.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[yatharthranjan]

@mpgxvii is this fixed with #432 ?

[mpgxvii]

Fixed in #432