Add gas param for data bytes in orders

[codchen]

Describe your changes and provide context

We are not charging gas based on data bytes contained in order payload which may open up a ddos attack vector (https://linear.app/seilabs/issue/SEI-4441/7ba-02-or-potential-dos-attack-and-loss-of-contract-rent-balance-via)

This PR adds a param and ante logic to require fee per byte in order data.

Testing performed to validate your change

unit test

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.24 🎉

Comparison is base (530877c) 63.30% compared to head (4c8bc37) 63.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #869      +/-   ##
==========================================
+ Coverage   63.30%   63.54%   +0.24%     
==========================================
  Files         249      250       +1     
  Lines       15499    15510      +11     
==========================================
+ Hits         9811     9856      +45     
+ Misses       5225     5187      -38     
- Partials      463      467       +4     

Impacted Files	Coverage Δ
x/dex/ante.go	67.52% <100.00%> (+0.85%)	⬆️
x/dex/migrations/v15_to_v16.go	100.00% <100.00%> (ø)
x/dex/types/params.go	79.31% <100.00%> (+0.73%)	⬆️

... and 3 files with indirect coverage changes

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