add inplacetestnet

[codchen]

Describe your changes and provide context

To use:

1. modify ~/.sei/config/config.toml: change mode to validator and turn off statesync
2. run `seid in-place-testnet

Testing performed to validate your change

run on a detached pacific-1 RPC node

[codecov]

Codecov Report

Attention: Patch coverage is 4.54545% with 21 lines in your changes missing coverage. Please review.

Project coverage is 61.54%. Comparing base (c2bc99c) to head (9604817).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/app.go	4.54%	20 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2063      +/-   ##
==========================================
+ Coverage   61.47%   61.54%   +0.07%     
==========================================
  Files         264      264              
  Lines       24608    24630      +22     
==========================================
+ Hits        15127    15159      +32     
+ Misses       8356     8342      -14     
- Partials     1125     1129       +4     

Files with missing lines	Coverage Δ
app/app.go	65.33% <4.54%> (-1.05%)	⬇️

... and 3 files with indirect coverage changes