modblob: scaffold BlobModule and it's API

[Wondertan]

Overview

We must establish infrastructure for the new BlobModule.

SubTasks

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1. Define API as outlined in BlobModule after it's finalized. Which include mocking, etc.
2. Define API proxy with relevant API permissions.
3. Introduce Blob structure and implement Commit method over apps CreateCommitment
4. Provide default implementation of the API: Submit method that uses StateModule and Get and Available methods using Getter interface
5. Docs

Refs

Depends on #1838 and
#1840

Optionally depends on #1839