added ibc transfer module to open API specs

[miladz68]

Description

Adds ibc transfer module to open API specs

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 ✅

Comparison is base (487a7e5) 33.04% compared to head (048c11f) 33.04%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #773   +/-   ##
=======================================
  Coverage   33.04%   33.04%           
=======================================
  Files         170      170           
  Lines       48255    48255           
=======================================
  Hits        15948    15948           
  Misses      29278    29278           
  Partials     3029     3029           

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[dzmitryhil]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @wojtek-coreum and @ysv)

[dzmitryhil]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @wojtek-coreum and @ysv)

[wojtek-coreum]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ysv)

[ysv]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @miladz68)

[wojtek-coreum]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @miladz68)