Token allow list feature. Bank module changes

[dssei]

Describe your changes and provide context

This change is part of token allow list feature implementation for token extensions.
Added functions to:

• persist denom allow list and query it
• check if from and to addresses are in allowlist on bank send and multi-send

Testing performed to validate your change

• unit testing
• functional testing (plugged modified code into sei-chain) and via ERC-20 pointer contract

[codecov]

Codecov Report

Attention: Patch coverage is 86.81319% with 12 lines in your changes missing coverage. Please review.

Project coverage is 54.88%. Comparing base (6b75f30) to head (f3d02f2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
x/bank/keeper/send.go	89.77%	6 Missing and 3 partials ⚠️
x/bank/types/key.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #538      +/-   ##
==========================================
+ Coverage   54.83%   54.88%   +0.05%     
==========================================
  Files         631      631              
  Lines       54808    54899      +91     
==========================================
+ Hits        30052    30132      +80     
- Misses      22604    22612       +8     
- Partials     2152     2155       +3     

Flag	Coverage Δ
	54.88% <86.81%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
x/bank/types/key.go	32.50% <0.00%> (-2.64%)	⬇️
x/bank/keeper/send.go	86.02% <89.77%> (+1.18%)	⬆️

... and 1 file with indirect coverage changes

[codchen]

is it intended to use the same IsAllowedToSendCoins for receiver validation?

[dssei]

Yeah, I was going on naming back and forth. But the same method is used for both sender and receiver validation.

[codchen]

has one nit but overall lgtm