create nextEpochMap type

[timwu20]

Changes

• nextEpochMap type which uses generics

Tests

go test -tags integration github.com/ChainSafe/gossamer

Issues

Primary Reviewer

@EclesioMeloJunior

[EclesioMeloJunior]

Cool stuff 👍 ! Feel free to merge your modifications!

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (eclesio/fix/block-production-for-epochs@9b69ffb). Click here to learn what that means.
The diff coverage is n/a.

@@                            Coverage Diff                             @@
##             eclesio/fix/block-production-for-epochs    #2633   +/-   ##
==========================================================================
  Coverage                                           ?   62.01%           
==========================================================================
  Files                                              ?      215           
  Lines                                              ?    28399           
  Branches                                           ?        0           
==========================================================================
  Hits                                               ?    17613           
  Misses                                             ?     9041           
  Partials                                           ?     1745           

Flag	Coverage Δ
unit-tests	62.01% <0.00%> (?)

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