Set app.toml values in docker test image

[tasiov]

Changes

• Set the following app parameters to new defaults, and allow them to be set with environment variables:

iavl-cache-size=1562500
simulation_gas_limit=50000000
query_gas_limit = 5000000
memory_cache_size=1000

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4c3715f) 11.94% compared to head (f79a0c8) 11.94%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #852   +/-   ##
=======================================
  Coverage   11.94%   11.94%           
=======================================
  Files         103      103           
  Lines       14324    14324           
=======================================
  Hits         1711     1711           
  Misses      12499    12499           
  Partials      114      114           

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