Add order sequence to DEX extension call.

[dzmitryhil]

Description

Add order sequence to DEX extension call.

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.44%. Comparing base (6a1b506) to head (b7d55ec).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1044   +/-   ##
=======================================
  Coverage   62.44%   62.44%           
=======================================
  Files         160      160           
  Lines       18589    18590    +1     
=======================================
+ Hits        11608    11609    +1     
  Misses       5863     5863           
  Partials     1118     1118           

Flag	Coverage Δ
coreum	57.10% <100.00%> (+<0.01%)	⬆️
coreum-integration-tests-modules	52.55% <100.00%> (+<0.01%)	⬆️

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[masihyeganeh]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @miladz68 and @ysv)

[miladz68]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ysv)