MSI: Add deprecation message to CatalogInventory SPIs

[lbajsarowicz]

Description (*)

Add deprecation information to CatalogInventory SPIs

Fixed Issues (if relevant)

Not applicable

Manual testing scenarios (*)

Not applicable

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @lbajsarowicz. Thank you for your contribution
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[magento-engcom-team]

Hi @maghamed, thank you for the review.
ENGCOM-4502 has been created to process this Pull Request

[VasylShvorak]

Notice: QA not applicable

[lbajsarowicz]

Isn't that against DRY? I mean - the method name is descriptive enough.

[ghost]

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