fix: add sunsethardfork config and fix panic issue

[j75689]

Description

1. add sunsethardfork config
2. ibc keeper did not set it correctly

Rationale

scKeeper is not copied when the app init stage. and it will panic in EndBlock to call the ibc.scKeeper

Example

n/a

Changes

Notable changes:

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Preflight checks

• build passed (make build)
• tests passed (make test)
• integration tests passed (make integration_test)
• manual transaction test passed (cli invoke)

Already reviewed by

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Related issues

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[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (09b52c7) 48.82% compared to head (ce87dd3) 48.84%.

Files	Patch %	Lines
app/config/config.go	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@              Coverage Diff              @@
##           bc-fusion     #988      +/-   ##
=============================================
+ Coverage      48.82%   48.84%   +0.02%     
=============================================
  Files            127      127              
  Lines          12788    12795       +7     
=============================================
+ Hits            6244     6250       +6     
- Misses          6114     6115       +1     
  Partials         430      430              

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