revert(nexus): remove gateway token support for amplifier (ref: bc0ae8fd, 1848c6b4)

[fish-sammy]

• Revert "feat(nexus)!: lock/unlock tokens from/to amplifier in core (feat(nexus)!: lock/unlock tokens from/to amplifier in core #2188)"
• Revert "feat(nexus): support CallContractWithToken from the nexus gateway contract (feat(nexus): support CallContractWithToken from the nexus gateway contract #2175)"
• small refactor
• keep renaming of the files

Description

Todos

• Unit tests
• Manual tests
• Documentation
• Connect epics/issues
• Tag type of change
• Upgrade handler

Steps to Test

Expected Behaviour

Other Notes

[codecov]

Codecov Report

Attention: Patch coverage is 26.92308% with 19 lines in your changes missing coverage. Please review.

Project coverage is 39.15%. Comparing base (22563b8) to head (13847cf).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
x/nexus/types/mock/expected_keepers.go	0.00%	18 Missing ⚠️
x/nexus/keeper/wasm_message_route.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2196      +/-   ##
==========================================
- Coverage   39.23%   39.15%   -0.08%     
==========================================
  Files         373      373              
  Lines       31733    31699      -34     
==========================================
- Hits        12449    12413      -36     
- Misses      18344    18350       +6     
+ Partials      940      936       -4     

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