Fix for swagger docs serving

[dssei]

Describe your changes and provide context

Swagger documentation should automatically be registered if api.swagger setting in app.toml is enabled

swagger = true

It was broken though, as this configuration was ignored in the app. Simply adding route would not work either. As just enabling it would pull swagger that is generated in sei-cosmos only lacking some modules APIs. Below solution adds similar capability to sei-chain level and is tweaked to involve ignite generated swagger API docs.

This change:

• adds swagger route (if configured)
• updates the path openapi/swagger yml is generated
• adds swagger-ui template
• introduces similar way of serving docs (with statik lib) to that of cosmos sdk (note, that we are not reusing the same scripts though, as in this repo we use ignite for openapi/swagger docs generation.
• updates README

Testing performed to validate your change

• unit test for adding swagger route
• deployed and tested on local node

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.79%. Comparing base (8884343) to head (6abc93d).

Additional details and impacted files

[](https://app.codecov.io/gh/sei-protocol/sei-chain/pull/1715?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sei-protocol) ```diff @@ Coverage Diff @@ ## main #1715 +/- ## ========================================== + Coverage 60.58% 60.79% +0.21% ========================================== Files 370 370 Lines 27422 27433 +11 ========================================== + Hits 16614 16679 +65 + Misses 9672 9614 -58 - Partials 1136 1140 +4 ``` | [Files](https://app.codecov.io/gh/sei-protocol/sei-chain/pull/1715?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sei-protocol) | Coverage Δ | | |---|---|---| | [app/app.go](https://app.codecov.io/gh/sei-protocol/sei-chain/pull/1715?src=pr&el=tree&filepath=app%2Fapp.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sei-protocol#diff-YXBwL2FwcC5nbw==) | `66.19% <83.33%> (+1.22%)` | :arrow_up: | ... and [4 files with indirect coverage changes](https://app.codecov.io/gh/sei-protocol/sei-chain/pull/1715/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sei-protocol)