refactor: remove MinThreshold and MinPercentage from x/foundation config

[0Tech]

Description

Remove the minimum boundary of the policies:

• MinThreshold
• MinPercentage

Motivation and context

After this patch is applied, we could out-source the proposal relevant logic to x/group later.

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

[codecov]

Codecov Report

Merging #686 (a54bf5a) into main (47eeccc) will increase coverage by 0.03%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #686      +/-   ##
==========================================
+ Coverage   61.01%   61.04%   +0.03%     
==========================================
  Files         873      873              
  Lines       98429    98421       -8     
==========================================
+ Hits        60054    60082      +28     
+ Misses      34787    34734      -53     
- Partials     3588     3605      +17     

Impacted Files	Coverage Δ
x/foundation/config.go	100.00% <ø> (ø)
x/foundation/foundation.go	76.75% <100.00%> (+0.94%)	⬆️
x/foundation/keeper/genesis.go	80.51% <100.00%> (ø)
x/collection/msgs.go	41.48% <0.00%> (+3.14%)	⬆️
x/foundation/msgs.go	43.26% <0.00%> (+3.36%)	⬆️
x/token/msgs.go	34.51% <0.00%> (+4.06%)	⬆️