Feature/489 bpi account crud api

[skosito]

Description

NOTE: I will add many-to-many relationship with bpi subject account in follow up PR, this is simple set up of bpi accounts CRUD as first step - opened new issue for it https://github.com/eea-oasis/baseline/issues/540

Related Issue

https://github.com/eea-oasis/baseline/issues/489

Motivation and Context

How Has This Been Tested

Screenshots (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Request to be added as a Code Owner/Maintainer

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [x] I commit to abide by the Responsibilities of Code Owners/Maintainers.