nit: add documentation for store/migrate contract on Keeper

[DimitrisJim]

Description

#6103 (comment)

closes: #XXXX

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• Targeted PR against the correct branch (see CONTRIBUTING.md).
• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Code follows the module structure standards and Go style guide.
• Wrote unit and integration tests.
• Updated relevant documentation (docs/).
• Added relevant godoc comments.
• Provide a conventional commit message to follow the repository standards.
• Include a descriptive changelog entry when appropriate. This may be left to the discretion of the PR reviewers. (e.g. chores should be omitted from changelog)
• Re-reviewed Files changed in the GitHub PR explorer.
• Review SonarCloud Report in the comment section below once CI passes.

Summary by CodeRabbit

• New Features
  • Enhanced security with new checks before storing contract code.
  • Introduced a method for migrating contract code for light clients.

[coderabbitai]

Walkthrough

The enhancements in the 08-wasm module focus on improving the storage and migration processes for Wasm code in the VM. These improvements include adding new checks before storing contract code and introducing a method for migrating contract code for a light client.

Changes

File Path	Change Summary
.../08-wasm/keeper/keeper.go	Enhanced functionality for storing and migrating Wasm code; added migration method for light clients

Possibly related issues

• Update 08-wasm documentation and migration docs for v0.4.x #6139: The updates to the 08-wasm module, particularly in documentation and migration, align with the changes requested in this issue for updating 08-wasm documentation and migration docs for v0.3.x.

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[sonarqubecloud]

Quality Gate passed for 'ibc-go'

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[damiannolan]

Really nice improvements to the non-existing godocs on these functions! :D
Great stuff!