refactor: modify tests to inject minimum app

[cloudgray]

Description

Closes: #832

• Provide a minimal, copy‑friendly evmd/app skeleton that only wires the foundational keepers so third‑party chain developers can drop it into their projects without carrying the full Cosmos SDK scaffolding.
• All of the extra keepers, precompiles, and test‑only plumbing that our existing suites rely on now live in lightweight wrappers tailored to each test harness; the wrappers layer their custom wiring on top of the base app before injecting it into the suites.

Consideration

• The reason why test code coverage is lower than before is because werc20 precompile tests were removed. I didn't handled werc20 precompile tests because it will be removed. (#808)

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Author Checklist

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I have...

• tackled an existing issue or discussed with a team member
• left instructions on how to review the changes
• targeted the main branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.51%. Comparing base (651ccd0) to head (f8587d2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #845      +/-   ##
==========================================
- Coverage   65.24%   62.51%   -2.73%     
==========================================
  Files         317      317              
  Lines       21613    21614       +1     
==========================================
- Hits        14101    13513     -588     
- Misses       6352     6895     +543     
- Partials     1160     1206      +46     

Files with missing lines	Coverage Δ
encoding/config.go	100.00% <100.00%> (ø)
x/vm/keeper/keeper.go	82.18% <100.00%> (+0.41%)	⬆️

... and 38 files with indirect coverage changes

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