refactor: move cmd to root and client to app

[ryanchristo]

Description

This pull request moves the entry point for the regen application to cmd/regen to align with go conventions. This pull request also moves client/docs to app/client/docs and updates swagger to use the new location and ibc-go v5.

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Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #1350 (5133f84) into master (9aef28b) will increase coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1350      +/-   ##
==========================================
+ Coverage   77.36%   77.40%   +0.03%     
==========================================
  Files         211      211              
  Lines       15395    15395              
==========================================
+ Hits        11910    11916       +6     
+ Misses       2582     2576       -6     
  Partials      903      903              

Impacted Files	Coverage Δ
app/app.go	73.55% <0.00%> (ø)
app/client/cli/genaccounts.go	15.15% <ø> (ø)
app/client/cli/root.go	58.10% <ø> (ø)
app/client/cli/testnet.go	16.79% <ø> (ø)
types/context.go	76.38% <0.00%> (+4.16%)	⬆️

[technicallyty]

tACK